The John Guest 1/2" grey acetal shut-off valve with long handle provides reliable and easy flow control for water treatment, RO systems, and window cleaning setups. Featuring a full-bore design, it allows maximum flow with minimal restriction, making it ideal for high-performance systems.

Designed for quick installation, the valve uses John Guest’s trusted push-fit technology to create a secure, leak-tight connection without the need for tools, sealants, or hot works. The collet locking system grips the pipe firmly without deforming it, ensuring a strong connection while maintaining full flow.

The ¼ turn long handle offers simple and clear operation, allowing you to easily isolate water supply when needed. Manufactured from durable grey acetal, the valve is corrosion resistant, fully demountable, and suitable for use with potable water, air, and inert gases (up to 50°C).

This product is available in two variants:

• Standard ON/OFF Valve (PISV0416S)
  Fully stops water flow when closed. Ideal for isolating parts of your system during use or maintenance. Commonly used on GrippaMAX systems for trolley fill-up and under-port shut-off points.
• RO Waste Restrictor Valve (PISV0416S)
  Designed for reverse osmosis systems. When turned off, it does not completely stop the flow — it allows a controlled amount of water (typically around 50%) to continue through the waste line, helping maintain correct system operation.

Manufactured and assembled in the UK, this valve is a reliable choice for professional window cleaners and filtration setups.