The Speedfit Plug 15mm (often referred to as a stem plug or stop end) is a specialized plumbing fitting engineered to securely cap off unused 15mm pipework, manifolds, or push-fit fittings. Designed for professional plumbers and heating engineers, it provides a fast, reliable, and watertight seal during system testing, alterations, or temporary shutdowns.
 
Manufactured from high-grade, durable engineering plastic, this plug incorporates the standard push-fit collet and O-ring locking mechanism. It can be pushed directly into any compatible 15mm push-fit fitting to instantly block off the water flow without the need for soldering or tools.
 
Fully demountable and reusable, this fitting is an essential trade consumable for managing plumbing extensions, isolating sections of domestic hot and cold water systems, or sealing off dead legs during kitchen and bathroom installations.