Number One STP

Handmade platinum silicone. The STP that gets out of your way and just works.

The Number One STP is a handcrafted platinum silicone stand-to-pee device from Number One Laboratory. This small studio has been making STPs for the trans community by hand for years, using the best materials they can get. Every unit is individually made and quality-checked before it ships.

This design puts steady flow first. A wider hole in the shaft means you don't have to hold back your stream to keep it from overflowing. You can just go at your normal pace without babysitting the device. The narrower bowl keeps the profile compact and packable. Made from platinum-cured body-safe silicone with a soft powder finish. That coating cuts down the sticky silicone feel on your skin, so you can skip packing powder for daily wear.

If you've heard of the Transthetics EZP, the Number One STP has a similar style and shape for a lot less money. It's a solid pick if you want a handcrafted, community-tested STP without paying top dollar for a high-end handmade one.

Currently out of stock. Use the "Notify me" option to be the first to know when it's back.

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📐 Product Details

Brand: Number One Laboratory, maker of handcrafted STPs for the trans community
Material: Platinum-Cured Body-Safe Silicone with soft powder finish

• Length: 6.25 inches
• Cup Length: 3.25 inches
• STP Height: 2.25 inches
• Cup Width: 1.5 inches
• Shaft Circumference: 3.5 inches
• Wider shaft opening: no need to hold back your stream
• Soft powder finish: less tacky silicone feel on your skin
• Completely handmade: each one finished and checked by hand
• STP + pack function: small enough to pack with every day
• Boilable for full sterilization

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🎨 Choosing Your Tone

Number One Laboratory offers two skin tones. If you are lighter-skinned, choose "Light". The "Medium" shade is closer to a light tan, and lighter-skinned customers are usually happier with Light. Not sure? Go lighter rather than darker for the most natural match on lighter skin.

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🩲 Best Pairings

The Number One STP was designed to be worn with Number One Laboratory's own Slingshot Harness. That's a low-profile thigh harness with no waistband that holds the STP securely between your legs. It also works with:

• Cake Bandit Harness: holds it in place under any underwear
• STP Briefs, STP Boxer Briefs, or STP Jock: a working fly keeps your device in place and ready

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🧼 Care & Cleaning

Platinum silicone is non-porous and one of the easiest materials to fully sterilize. Clean using any of the following:

• Hot water and soap: your everyday after-use rinse
• TGS Packer & Toy Cleaner: faster, and it conditions the silicone surface
• Diluted bleach solution: 10 parts water, 1 part bleach, rinse thoroughly
• Boil for 3–5 minutes: full sterilization
• Overnight denture cleaning tablets: soak, rinse, air-dry

Air-dry completely before storing. Store in a cool, dry place out of direct sunlight. For long-term storage, dust lightly with Packer Renewing Powder to maintain the soft surface finish.

Do not use silicone-based lubricants. They can break down platinum silicone surfaces over time. Water-based only.

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🚿 First-Time Use Tips

The wider shaft opening makes flow easier to handle than narrower designs, so you don't have to hold back your stream as much. Still, every STP device handles a little differently. Practice in these stages before you try it out in the world:

1. Shower, water off: practice the seal with no clothes on so you can easily spot any leaks
2. Toilet, no clothing: build muscle memory for where the cup goes
3. Underwear on: a harness or STP underwear keeps the device where it should be
4. Fully dressed: once you're staying dry at home every time with clothes on, you're urinal-ready

For the full technique guide, read our Complete STP Guide.

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❓ FAQ

How does this compare to the STP Freely?
The Number One STP is handcrafted by a small studio. It's built differently, the silicone feels different, and it looks different. The STP Freely is TGS's in-house design. It's softer, bends more for packing, works as a 3-in-1, and comes in more skin tones. Both use platinum silicone. Choose based on which design and style feels right for your body.

Is this good for packing as well as peeing?
Yes. It's small enough to pack with every day. The silicone is firmer than TGS soft silicone, so a snug harness or STP underwear helps keep it in position throughout the day.

What happened to Form Function?
Number One Laboratory used to be called Form Function. Same studio, same handmade construction, rebranded.

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📦 Shipping & Returns

Orders typically ship within 1–3 business days in plain, unmarked packaging from our shipping dept. No logos, no product names, nothing that gives away what's inside. Learn more about our discreet shipping promise.

All sales of STPs, packers, harnesses, pleasure toys, swimwear, and underwear are final due to legal restrictions. See our full Returns & Refund Policy.

All international orders are final sale. Local taxes, duties, and customs fees are the customer's responsibility. See Shipping Policies.