Model A STP-packer

Model A is the sturdiest STP from Number One Laboratory, with a large receptacle cup to pee through. It has a realistic head and hanging balls, and is compatible with the Slingshot Harness.

The surface has a soft powder finish, designed to help reduce chafing and tacky silicone feel. 

Available in three colours and in an uncut or cut version.

Because it's a bit bigger with a larger receptacle cup, the Model A is extremely user-friendly. With its generous space to pee into, no flow-control is needed.

This STP fits best in pants with a longer zipper, and includes instructions on how to easily construct a harness from a store-bought pair of underwear.

Handmade in the USA, Number One Laboratory specializes in realistic 100% soft platinum-cured silicone STP packers that  are easy to use and comfortable to wear.

Includes instructions on how to easily construct a harness from a store-bought pair of underwear.