This seal is designed for cylinders where the entry is "reverse flanged", which means the flared tube actually turns back towards the far end. Cylinders like this were not designed for use with a separate seal. (Because there were none available!) Instead, the rim fits directly against the skin. The reversed flange idea reduces the problems of leaks due to hair contact, but it also concentrates pressure and makes the cylinders uncomfortable, and usually downright painful. PumpToy's Two-Stage Seal reverses the flange direction, and provides a soft, comfortable surface to mate with your body!

The MT-3 is applicable to cylinder with an INSIDE dimension of 2-7/8" minimum to 4" maximum. It does not fit over or adhere to the cylinder, it simply fits between you and the rim. This seal also works for cylinders with a flat (90 degree to tube) flange ring around the entry, in the same dimensions.

The MT3 is injection molded, and made of the same gel-soft plastic as our STJ Precision Seal, which has received rave reviews from every user. This seal is substantial, measuring a full 1-1/2" thick and 5" across. The entry is cone shaped like our SPS, and distributes the cylinder pressure over a wide area. This seal will fit both the senior and junior monstertubes, and reverse-flanged cylinders with an opening ID of 3" to 4". 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.

Here's a recent comment from an MT3 user:
"I got the MT3 seal for use with my Monster tube and I love it! It is very comfortable - it removes the torture from using the Monstertube!"

MONSTERTUBE OWNERS, this fits both the standard and Jr. models. See our comments page for the opinion of another MT pumper using this seal!

Tired of getting squeezed with your two-stage? Get the MT3!

Part # MT3 - PumpToys MT3 Seal for Monstertube & most 2-stage Cylinders   $35.00

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NOTE: Variations in cylinder design may affect the fit and performance of this seal. While the overall success of this seal is outstanding- due to these variations, we cannot guarantee total compatibility with your particular cylinder.