Number One STP

by Number One Laboratories


The Number One STP is Number One Laboratories' original STP model.

Those familiar with Transthetic's EZP will recognize the style and shape of this STP packer, though this model comes at a 3rd of the price. Compared to the EZP, the Number One STP has a narrower bowl but a wider hole in the shaft. This wider hole allows for use without restricting your stream. The lower price tag makes this a great STP for beginners. 

Check out Alexander Erin's Review:



Number One Laboratory* STPs are made from Platinum Silicone with a soft powder finish. Every model sold is completely handmade using the best materials available and thoroughly checked for quality and durability. 

- Length: 6.25 inches 
- Cup Length: 3.25 inches 
- STP Height: 2.25"
- Cup Width: 1.5 inches 
- Shaft Circumference: 3.5 inches 

Platinum silicone may be cleaned using any one of the following methods:
- Hot water and soap
- Diluted bleach
- Overnight denture cleaning tablets
- Boil for 3-5 minutes

The Slingshot Harness is a harness made to pair with this STP. 

If you are not a person of color, we strongly encourage you to buy the "light" tone. Historically, white folks have generally been unhappy with the "medium" shade, which is similar in color to a light brown M&M. 


*First-time users, we strongly recommend that you practice in the shower before attempting to use it in public. Even if you have had success with other STPs in the past, every STP is different and requires some getting used to. 

*Please note that due to the sensitive nature of this product, all sales are final. 

*This company used to be called Form Function 

Customer Reviews

Based on 1 review
Stand to Pee on self if not careful

We Ship Discretely

Transguy Supply respects your privacy and acknowledges your right to self-determination. All shipments arrive in plain packaging and are shipped from "TG Supply."

Shipping Schedule

We ship out orders 2 times per week. You can generally expect your order to ship within 4 days of placing your order.

Final Sales

Please note that due to the sensitive nature of the items in question, all STP, Packer and Underwear sales are final. Please make sure you have double-checked product size guides and have selected the correct item.