{"product_id":"caplugs-300-3817-02s-ldpe-two-position-snap-cap-17mm-ps-tube","title":"Test Tubes, LDPE, Natural — 300-3817-02S | 1000\/Bag | Caplugs® Evergreen","description":"\u003ch2\u003eTwo-Position Snap Caps, For 17 mm PS Test Tubes, LDPE, Natural — 300-3817-02S | 1000\/Bag\u003c\/h2\u003e \u003ctable\u003e \u003cthead\u003e\u003ctr\u003e\u003cth colspan=\"2\"\u003eQuick Reference — 300-3817-02S\u003c\/th\u003e\u003c\/tr\u003e\u003c\/thead\u003e \u003ctbody\u003e \u003ctr\u003e \u003ctd\u003e\u003cstrong\u003eTube Format\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003e17 mm PS test tubes\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e\u003cstrong\u003eCap Type\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003eTwo-position snap cap\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003eLow-Density Polyethylene (LDPE)\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e\u003cstrong\u003eColor\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003eNatural\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e\u003cstrong\u003ePosition 1\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003ePartial-open — gas exchange \/ venting\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e\u003cstrong\u003ePosition 2\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003eFully closed — sealed for storage\/transport\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e\u003cstrong\u003evs 12 mm snap\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003e300-3812-02S for 12 mm PS tubes — same function\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e\u003cstrong\u003eSterility\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003eNon-Sterile\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e\u003cstrong\u003ePack Size\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003e1000 \/ Bag\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e\u003cstrong\u003ePrice\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003e$58.88 \/ Bag ($0.0589 \/ cap)\u003c\/td\u003e \u003c\/tr\u003e \u003c\/tbody\u003e \u003c\/table\u003e \u003ch2\u003eTechnical Narrative\u003c\/h2\u003e \u003cp\u003eThe Caplugs® Evergreen is an LDPE two-position snap cap for 17 mm PS test tubes — extending the two-position snap functionality of the 300-3812 (12 mm) series to the larger 17 mm test tube format. The partial-open position allows CO₂ and O₂ gas exchange during microbiology culture tube incubation; the fully-closed position seals the tube for refrigerated storage and transport. The cap remains attached in both positions — no loose cap to set down or misplace between incubation and storage.\u003c\/p\u003e \u003cp\u003e17 mm test tubes are a common large-format culture tube size — the snap cap scales the two-position function to this format at $58.88\/1000 (0.0589\/cap). The PS tube variant  is dimensioned for 17 mm PS tubes; the PP variant (300-3817-02P) fits 17 mm PP tubes at the same price.\u003c\/p\u003e \u003ch2\u003eTechnical Specifications — Caplugs® Evergreen \u003c\/h2\u003e \u003ctable\u003e \u003cthead\u003e\u003ctr\u003e \u003cth\u003eSpecification\u003c\/th\u003e \u003cth\u003eValue\u003c\/th\u003e \u003c\/tr\u003e\u003c\/thead\u003e \u003ctbody\u003e \u003ctr\u003e \u003ctd\u003ePart Number\u003c\/td\u003e \u003ctd\u003e\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eCaplugs Item #\u003c\/td\u003e \u003ctd\u003e300381702SE1\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eTube Format\u003c\/td\u003e \u003ctd\u003e17 mm PS test tubes\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eCap Style\u003c\/td\u003e \u003ctd\u003eTwo-position snap cap\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003ePosition 1\u003c\/td\u003e \u003ctd\u003ePartial-open — gas exchange\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003ePosition 2\u003c\/td\u003e \u003ctd\u003eFully closed — sealed\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eMaterial\u003c\/td\u003e \u003ctd\u003eLow-Density Polyethylene (LDPE)\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eColor\u003c\/td\u003e \u003ctd\u003eNatural\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003evs PP variant\u003c\/td\u003e \u003ctd\u003e300-3817-02P — same cap, fits 17 mm PP tubes\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003evs 12 mm variant\u003c\/td\u003e \u003ctd\u003e300-3812-02S — same function, fits 12 mm PS tubes\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eSterility\u003c\/td\u003e \u003ctd\u003eNon-Sterile\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003ePack Size\u003c\/td\u003e \u003ctd\u003e1000 \/ Bag\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eBPA\/Phthalate\u003c\/td\u003e \u003ctd\u003eBPA-free; no phthalate plasticizers\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eCountry of Origin\u003c\/td\u003e \u003ctd\u003eMade in U.S.A. (California)\u003c\/td\u003e \u003c\/tr\u003e \u003c\/tbody\u003e \u003c\/table\u003e \u003ch2\u003eTwo-Position Snap Cap Compatibility — 17 mm PS\u003c\/h2\u003e \u003cp\u003eThe fits 17 mm PS test tubes for workflows requiring both vented incubation and sealed storage:\u003c\/p\u003e \u003ctable\u003e \u003cthead\u003e\u003ctr\u003e \u003cth\u003eApplication\u003c\/th\u003e \u003cth\u003eUse \/ Storage\u003c\/th\u003e \u003cth\u003eNotes\u003c\/th\u003e \u003c\/tr\u003e\u003c\/thead\u003e \u003ctbody\u003e \u003ctr\u003e \u003ctd\u003e17 mm culture tube capping\u003c\/td\u003e \u003ctd\u003e17 mm OD glass and PP\/PS culture tubes\u003c\/td\u003e \u003ctd\u003eTwo-position snap: partial-open for gas exchange, closed for storage\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eMicrobiology broth culture\u003c\/td\u003e \u003ctd\u003eTSB, BHI, LB in 17 mm culture tubes\u003c\/td\u003e \u003ctd\u003ePartial-open position maintains culture atmosphere during incubation\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eSealed storage cycling\u003c\/td\u003e \u003ctd\u003e17 mm tube storage between incubation runs\u003c\/td\u003e \u003ctd\u003eFully closed position seals tube for refrigerated\/frozen hold\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eCell culture 17 mm tubes\u003c\/td\u003e \u003ctd\u003eSuspension culture, virus propagation\u003c\/td\u003e \u003ctd\u003ePartial-open for CO₂ exchange; closed for transport\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eSequential open\/close cycling\u003c\/td\u003e \u003ctd\u003eTubes accessed multiple times per workflow\u003c\/td\u003e \u003ctd\u003eSnap stays attached — no loose cap to misplace\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eClinical chemistry tubes\u003c\/td\u003e \u003ctd\u003eLarge-format 17 mm sample tubes\u003c\/td\u003e \u003ctd\u003eClosed position prevents evaporation pre-analysis\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eEnvironmental sampling\u003c\/td\u003e \u003ctd\u003eField collection in 17 mm tubes\u003c\/td\u003e \u003ctd\u003eClosed snap for transport; partial-open for field sampling\u003c\/td\u003e \u003c\/tr\u003e \u003c\/tbody\u003e \u003c\/table\u003e \u003cp\u003e\u003cem\u003eValidate snap fit with your tube brand before bulk purchase. For 17 mm PP tubes: 300-3817-02P. For 12 mm PS tubes: 300-3812-02S.\u003c\/em\u003e\u003c\/p\u003e \u003ch2\u003eChemical Resistance — Low-Density Polyethylene (LDPE)\u003c\/h2\u003e \u003cp\u003eLDPE provides flex for snap-position engagement and inertness to culture media.\u003c\/p\u003e \u003ctable\u003e \u003cthead\u003e\u003ctr\u003e \u003cth\u003eReagent \/ Condition\u003c\/th\u003e \u003cth\u003eCompatibility\u003c\/th\u003e \u003c\/tr\u003e\u003c\/thead\u003e \u003ctbody\u003e \u003ctr\u003e \u003ctd\u003eAqueous buffers \/ culture media\u003c\/td\u003e \u003ctd\u003e✓ Excellent\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eDilute acids (\u0026lt;10%)\u003c\/td\u003e \u003ctd\u003e✓ Good\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eShort-chain alcohols (brief)\u003c\/td\u003e \u003ctd\u003e✓ Good\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eDMSO (≤10%)\u003c\/td\u003e \u003ctd\u003e✓ Good\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eAutoclave (121°C)\u003c\/td\u003e \u003ctd\u003e✗ Not compatible — LDPE softens\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eStorage at -20°C\u003c\/td\u003e \u003ctd\u003e✓ Suitable — LDPE retains flexibility\u003c\/td\u003e \u003c\/tr\u003e \u003c\/tbody\u003e \u003c\/table\u003e \u003ch2\u003e300-3817 Two-Position Snap Cap Variants\u003c\/h2\u003e \u003ctable\u003e \u003cthead\u003e\u003ctr\u003e \u003cth\u003ePart Number\u003c\/th\u003e \u003cth\u003eTube\u003c\/th\u003e \u003cth\u003ePrice\/1000\u003c\/th\u003e \u003c\/tr\u003e\u003c\/thead\u003e \u003ctbody\u003e \u003ctr\u003e \u003ctd\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003e\u003cstrong\u003e17 mm PS\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003e$58.88\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e300-3817-02P\u003c\/td\u003e \u003ctd\u003e17 mm PP\u003c\/td\u003e \u003ctd\u003e$58.88\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e300-3812-02S\u003c\/td\u003e \u003ctd\u003e12 mm PS (smaller)\u003c\/td\u003e \u003ctd\u003e$56.57\u003c\/td\u003e \u003c\/tr\u003e \u003c\/tbody\u003e \u003c\/table\u003e \u003ch2\u003eLaboratory Applications\u003c\/h2\u003e \u003cp\u003eServes microbiology labs running broth culture in 17 mm PS tubes requiring vented incubation and sealed storage; clinical and research programs using 17 mm culture tubes; and any 17 mm PS tube workflow requiring two-position vented\/sealed function.\u003c\/p\u003e \u003ch2\u003eU.S. Manufacturing, Quality \u0026amp; Institutional Procurement\u003c\/h2\u003e \u003cp\u003eEvery Caplugs® Evergreen lot is precision-molded at our California manufacturing facility. We supply reference laboratories, hospital systems, and federal procurement offices under institutional pricing programs. \u003ca href=\"#request-sample\"\u003eRequest a free sample below\u003c\/a\u003e to validate fit before committing to volume.\u003c\/p\u003e \u003ch2\u003eFrequently Asked Questions — Caplugs® Evergreen \u003c\/h2\u003e \u003ch3\u003eWhat are the two positions on the 17 mm snap cap?\u003c\/h3\u003e \u003cp\u003ePosition 1 (partial-open): the cap is held ajar by the first snap — allows gas exchange for culture tube incubation without contamination. Position 2 (fully closed): the cap is fully seated for sealed storage and transport. The cap stays attached in both positions.\u003c\/p\u003e \u003ch3\u003eWhat is the difference between the PS variant  and the PP variant (300-3817-02P)?\u003c\/h3\u003e \u003cp\u003eBoth are LDPE two-position snap caps for 17 mm test tubes. The only difference is the tube material they fit: is dimensioned for 17 mm PS tubes; 300-3817-02P for 17 mm PP tubes. PP and PS tubes of the same OD can have slightly different wall thicknesses requiring different snap dimensions. Always validate fit with a sample before bulk purchase.\u003c\/p\u003e \u003ch3\u003eHow does the 17 mm snap cap compare to the 12 mm snap cap family?\u003c\/h3\u003e \u003cp\u003eThe 300-3817 (17 mm) and 300-3812 (12 mm) series are identical in two-position snap function — partial-open gas exchange and fully-closed sealed position — but are dimensioned for different tube formats. Both come in PP and PS tube variants. The 17 mm is slightly more expensive ($58.88 vs $56.57\/1000) reflecting the larger cap size.\u003c\/p\u003e \u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"Product\",\n  \"name\": \"Two-Position Snap Caps, For 17 mm PS Test Tubes, Non-Sterile, Low-Density Polyethylene (LDPE), Natural \\u2014 300-3817-02S | 1000\/Bag | Caplugs\\u00ae Evergreen\",\n  \"description\": \"Caplugs\\u00ae Evergreen 300-3817-02S. LDPE two-position snap caps for 17 mm PS test tubes, natural, 1000\/Bag. Vented + sealed positions. BPA-free. USA.\",\n  \"sku\": \"300381702SE1\",\n  \"mpn\": \"300-3817-02S\",\n  \"material\": \"Low-Density Polyethylene (LDPE)\",\n  \"color\": \"Natural\",\n  \"brand\": {\n    \"@type\": \"Brand\",\n    \"name\": \"Caplugs\\u00ae Evergreen\"\n  },\n  \"manufacturer\": {\n    \"@type\": \"Organization\",\n    \"name\": \"Caplugs\\u00ae Evergreen\",\n    \"address\": {\n      \"@type\": \"PostalAddress\",\n      \"addressCountry\": \"US\",\n      \"addressRegion\": \"CA\"\n    }\n  },\n  \"offers\": {\n    \"@type\": \"Offer\",\n    \"price\": \"58.88\",\n    \"priceCurrency\": \"USD\",\n    \"availability\": \"https:\/\/schema.org\/InStock\",\n    \"itemCondition\": \"https:\/\/schema.org\/NewCondition\",\n    \"seller\": {\n      \"@type\": \"Organization\",\n      \"name\": \"LabSupplies\"\n    }\n  },\n  \"additionalProperty\": [\n    {\n      \"@type\": \"PropertyValue\",\n      \"name\": \"Tube Compatibility\",\n      \"value\": \"17 mm PS test tubes\"\n    },\n    {\n      \"@type\": \"PropertyValue\",\n      \"name\": \"Pack Size\",\n      \"value\": \"1000 \/ Bag\"\n    },\n    {\n      \"@type\": \"PropertyValue\",\n      \"name\": \"Sterility\",\n      \"value\": \"Non-Sterile\"\n    },\n    {\n      \"@type\": \"PropertyValue\",\n      \"name\": \"Country of Origin\",\n      \"value\": \"United States\"\n    },\n    {\n      \"@type\": \"PropertyValue\",\n      \"name\": \"BPA Free\",\n      \"value\": \"Yes\"\n    }\n  ]\n}\n\u003c\/script\u003e \u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What are the two positions on the 17 mm snap cap?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Position 1 (partial-open): the cap is held ajar by the first snap \\u2014 allows gas exchange for culture tube incubation without contamination. Position 2 (fully closed): the cap is fully seated for sealed storage and transport. The cap stays attached in both positions.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the difference between the PS variant (300-3817-02S) and the PP variant (300-3817-02P)?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Both are LDPE two-position snap caps for 17 mm test tubes. The only difference is the tube material they fit: 300-3817-02S is dimensioned for 17 mm PS tubes; 300-3817-02P for 17 mm PP tubes. PP and PS tubes of the same OD can have slightly different wall thicknesses requiring different snap dimensions. Always validate fit with a sample before bulk purchase.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How does the 17 mm snap cap compare to the 12 mm snap cap family?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The 300-3817 (17 mm) and 300-3812 (12 mm) series are identical in two-position snap function \\u2014 partial-open gas exchange and fully-closed sealed position \\u2014 but are dimensioned for different tube formats. Both come in PP and PS tube variants. The 17 mm is slightly more expensive ($58.88 vs $56.57\/1000) reflecting the larger cap size.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"Caplugs® Evergreen","offers":[{"title":"Default Title","offer_id":48567936483560,"sku":"300-3817-02S","price":58.88,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0694\/5361\/1240\/files\/300-3812-02S_03_be366f69-56bd-4a11-9b3f-e57097e0c4c0.jpg?v=1779074786","url":"https:\/\/labsupplies.com\/products\/caplugs-300-3817-02s-ldpe-two-position-snap-cap-17mm-ps-tube","provider":"LabSupplies.com","version":"1.0","type":"link"}