NEW! See our quick guidelines for using the STJ Precision Seal in combination with a DIY Chamber or Cylinder
The injection-molded STJ Precision Seal is a great tool for the pumper- and hard to improve on. However, it is a "working" part and it does have a life span limit. Part of that limit is due to the plasticized PVC it's made of, and we have been looking at alternative materials to develop an even better product without losing the qualities of the soft PVC. This new version of the famous seal is identical in design- it fits the same cylinders in the same way. The only difference is the material. It's cast in a special mold, using a pure high-grade silicone.
The Silicone STJ Seal has several advantages!
- Retains softness indefinitely.
- The inert silicone is compatible with any lubricant.
- It's not adversely affected by plastics or cleaners.
- Maintenance is simple, just clean and store flat.
- It's hypo-allergenic.
- High elongation, easy to remove over extra large pumps.
This seal will fit the common STJ, and all PumpToy's combination
cylinders- the ASTJ, the LongJohnny, and the original BullMaster. It will also
fit other straight-rim cylinders where the rim is 1/4" or less in
thickness, with openings from 3-3/4" to 4". If you have questions about
fitting- please inquire before
ordering! Please note that petrochemical based lubricants are not
compatible with Precision seals, and are also damaging to acrylic
cylinders. We recommend only GLYDE, a natural vegetable-based lube designed specifically for pumping.
The Silicone Seal does not replace the standard version! The costs of silicone material and the process of producing this seal make it much more expensive than the standard seal. The Silicone STJ Seal is an optional upgrade, that will be appreciated by those who pump most frequently or to very large size.
Technical Specifications
| Availability: | SHIPPING STATUS: CURRENTLY NO SHELF STOCK WITH MORE SILICONE ARRIVING JUNE 5. SILICONE STJ’S SHOULD BE BACK IN STOCK FOR SHIPMENT MONDAY JUNE 9. |
|---|---|
| Printable Care & Data Info for this product: | https://www.pumptoys.com/prod/STJ_usage.htm |
| This item is compatible with: | ASTJ, LongJohnny, BullMaster, Magnum, and may also fit other straight-end cylinders with .25" wall thickness and a diameter close to 4 inches. NOT for use with the BullMaster357 |
Customer Reviews
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A game changer
Related Products
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ASTJ- Custom Length
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BullMaster Contoured Shaping CylinderDiscontinued? Not a chance! Stay tuned right here and you'll know the moment there's a change in status! |
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BullMaster Magnum Contoured Shaping CylinderDiscontinued? Not a chance! Stay tuned right here and you'll know the moment there's a change in status! |
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LongJohnnyA thick-wall 4-inch ID straight cylinder in the standard 9-inch length which uses the STJ cushion gasket seal |
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LongJohnny-Custom ShortThe same roomy 4-inch ID and heavy wall of the stock LongJohnny, just reduced in length to suit your needs. |
This product was added to our catalog on August 31, 2010.
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