Number One STP
$35.00 $55.00Discreet shipping on every order. Your order ships in a plain, unmarked box. No logos, no product names, nothing that reveals what's inside. The shipping label won't mention Transguy Supply or any product details. Learn more
Go at your own pace.
A handmade STP from Number One Laboratory with a wider shaft opening, so you don't have to hold back your stream. A handmade STP prosthetic.
Number One Laboratory is a small studio that's been making STPs for our community for years. The soft powder finish on the platinum-cured silicone cuts the sticky feel, so you can skip daily powder.
- Length: 6.25"
- Cup length: 3.25"
- STP height: 2.25"
- Cup width: 1.5"
- Shaft circumference: 3.5"
- Material: platinum-cured, body-safe silicone with a soft powder finish
- Boilable
- Each one is made and checked by hand.
- The narrow bowl keeps it compact enough to pack every day.
- A similar style and shape to the Transthetics EZP, for a lot less.
- Number One Laboratory used to be called Form Function.
It's firmer than our TGS soft silicone, so a snug harness or STP underwear helps keep it in place. It was made for Number One's own Slingshot Harness, a low-profile thigh harness with no waistband. It also works with a Cake Bandit harness, or STP briefs, STP boxer briefs, or an STP jock with a working fly.
Choosing a tone: it comes in Light and Medium. Medium is closer to a light tan, so if you have lighter skin, pick Light. When in doubt, go lighter.
Every STP handles a little differently, so practice at home before you use it out.
- In the shower with the water off and no clothes, so you can spot any leaks.
- Over the toilet with no clothes, to learn where the cup goes.
- In a harness or STP underwear, which keeps it where it should be.
- Fully dressed. Once you're staying dry every time at home, you're ready for the urinal.
More in our STP guide.
- Rinse with hot water and soap after each use, or use our packer & toy cleaner.
- To sterilize, boil it for 3–5 minutes, soak it in 10 parts water to 1 part bleach and rinse well, or soak it overnight with denture cleaning tablets.
- Let it air dry completely, then store it somewhere cool and dry, out of the sun.
- Use water-based lube only. Silicone lube can break down platinum silicone over time.
- Dust with Packer Renewing Powder every day after washing, and before storing it.
- Want something softer that bends more, with a 3-in-1 option? Try the STP Freely.
- Cake Bandit harness: a snug hold that keeps it in place.
- STP briefs or STP boxer briefs: snug STP underwear.
- STP jock: with a working fly.
Orders ship in 1–3 business days in plain packaging from our shipping dept., with no logos or product names on the outside. More on discreet shipping.
Packers and STPs are final sale, and so are all international orders. International customers cover local taxes, duties, and customs fees. Return policy.
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