Caplugs® Evergreen
Test Tubes, LDPE, Natural — 300-3817-02P | 1000/Bag | Caplugs® Evergreen
Test Tubes, LDPE, Natural — 300-3817-02P | 1000/Bag | Caplugs® Evergreen
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Two-Position Snap Caps, For 17 mm PP Test Tubes, LDPE, Natural — 300-3817-02P | 1000/Bag
| Quick Reference — 300-3817-02P | |
|---|---|
| Tube Format | 17 mm PP test tubes |
| Cap Type | Two-position snap cap |
| Material | Low-Density Polyethylene (LDPE) |
| Color | Natural |
| Position 1 | Partial-open — gas exchange / venting |
| Position 2 | Fully closed — sealed for storage/transport |
| vs 12 mm snap | 300-3812-02P for 12 mm PP tubes — same function |
| Sterility | Non-Sterile |
| Pack Size | 1000 / Bag |
| Price | $58.88 / Bag ($0.0589 / cap) |
Technical Narrative
The Caplugs® Evergreen is an LDPE two-position snap cap for 17 mm PP 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.
17 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 PP tube variant is dimensioned for 17 mm PP tubes; the PS variant (300-3817-02S) fits 17 mm PS tubes at the same price.
Technical Specifications — Caplugs® Evergreen
| Specification | Value |
|---|---|
| Part Number | |
| Caplugs Item # | 300381702PE1 |
| Tube Format | 17 mm PP test tubes |
| Cap Style | Two-position snap cap |
| Position 1 | Partial-open — gas exchange |
| Position 2 | Fully closed — sealed |
| Material | Low-Density Polyethylene (LDPE) |
| Color | Natural |
| vs PS variant | 300-3817-02S — same cap, fits 17 mm PS tubes |
| vs 12 mm variant | 300-3812-02P — same function, fits 12 mm PP tubes |
| Sterility | Non-Sterile |
| Pack Size | 1000 / Bag |
| BPA/Phthalate | BPA-free; no phthalate plasticizers |
| Country of Origin | Made in U.S.A. (California) |
Two-Position Snap Cap Compatibility — 17 mm PP
The fits 17 mm PP test tubes for workflows requiring both vented incubation and sealed storage:
| Application | Use / Storage | Notes |
|---|---|---|
| 17 mm culture tube capping | 17 mm OD glass and PP/PS culture tubes | Two-position snap: partial-open for gas exchange, closed for storage |
| Microbiology broth culture | TSB, BHI, LB in 17 mm culture tubes | Partial-open position maintains culture atmosphere during incubation |
| Sealed storage cycling | 17 mm tube storage between incubation runs | Fully closed position seals tube for refrigerated/frozen hold |
| Cell culture 17 mm tubes | Suspension culture, virus propagation | Partial-open for CO₂ exchange; closed for transport |
| Sequential open/close cycling | Tubes accessed multiple times per workflow | Snap stays attached — no loose cap to misplace |
| Clinical chemistry tubes | Large-format 17 mm sample tubes | Closed position prevents evaporation pre-analysis |
| Environmental sampling | Field collection in 17 mm tubes | Closed snap for transport; partial-open for field sampling |
Validate snap fit with your tube brand before bulk purchase. For 17 mm PS tubes: 300-3817-02S. For 12 mm PP tubes: 300-3812-02P.
Chemical Resistance — Low-Density Polyethylene (LDPE)
LDPE provides flex for snap-position engagement and inertness to culture media.
| Reagent / Condition | Compatibility |
|---|---|
| Aqueous buffers / culture media | ✓ Excellent |
| Dilute acids (<10%) | ✓ Good |
| Short-chain alcohols (brief) | ✓ Good |
| DMSO (≤10%) | ✓ Good |
| Autoclave (121°C) | ✗ Not compatible — LDPE softens |
| Storage at -20°C | ✓ Suitable — LDPE retains flexibility |
300-3817 Two-Position Snap Cap Variants
| Part Number | Tube | Price/1000 |
|---|---|---|
| 17 mm PP | $58.88 | |
| 300-3817-02S | 17 mm PS | $58.88 |
| 300-3812-02P | 12 mm PP (smaller) | $56.57 |
Laboratory Applications
Serves microbiology labs running broth culture in 17 mm PP tubes requiring vented incubation and sealed storage; clinical and research programs using 17 mm culture tubes; and any 17 mm PP tube workflow requiring two-position vented/sealed function.
U.S. Manufacturing, Quality & Institutional Procurement
Every 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. Request a free sample below to validate fit before committing to volume.
Frequently Asked Questions — Caplugs® Evergreen
What are the two positions on the 17 mm snap cap?
Position 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.
What is the difference between the PP variant and the PS variant (300-3817-02S)?
Both 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 PP tubes; 300-3817-02S for 17 mm PS 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.
How does the 17 mm snap cap compare to the 12 mm snap cap family?
The 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.
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