STJ Precision Seal

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 unique. Besides fitting PumpToy's large cylinders, it brings a variety of advantages to the simple and inexpensive Sun Tea Jar pump. With this seal, you can have a pump that is as effective and more comfortable than any standard two-stage cylinder, for a total investment of LESS THAN $40.00! PumpToys also makes an STJ Conversion Kit that will allow you to convert a Sun tea jar to a pump in one minute.

To learn how to make a Sun Tea Jar into a basic pump cylinder for less than $10, look at the Making an STJ Pump article in our library.

Features of the STJ Precision Seal:

• It's very comfortable, made of a soft gel-like plastic. NO hot-spots!
• The seal is positive and trouble-free.
• The entry is wide and funnel-shaped, eliminating the "pubic bulge" problem.
• The opening reduces to 2-3/4", making your STJ into a two-stage!
• Circulation is improved by better entry pressure distribution; You pump larger and faster!
• The effects are terrific! Your pumped shape is more natural, necking at the top, and swinging!
• The seal is left in place when you remove the cylinder- you get the full 4" opening to exit!
• The seal is elastic, and is removed by simply stretching it over your pumped package!

This seal will fit the common STJ, and all PumpToy's combination cylinders- the ASTJ, the LongJohnny, and the original BullMaster and Magnum. (It is not compatible with the BullMaster 357) 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.