The 25mm to 1 inch female adaptor by Elysee is a commercial-grade compression fitting designed to transition a 25mm MDPE or HDPE water line directly onto a 1″ male threaded connection. Whether you are connecting your main water line to a threaded brass tap, linking up to a pump system, or plumbing into a plastic valve box manifold, this rugged 25mm to 1 inch female adaptor ensures a flawless, high-pressure seal every time.

Built to a trade-preferred PN10 pressure rating, this transition fitting safely manages continuous working pressures of up to 10 bar. It is constructed from premium UV-stabilised materials that prevent cracking under intense sunlight or brittle failure during hard British winters, making it ideal for both deep underground trenches and exposed above-ground installations.

Why Choose the Elysee 25mm to 1″ Female Adaptor?

Professional irrigation engineers and landscapers across the UK rely on Elysee compression fittings because they eliminate the weak points often found in cheaper alternative brands.

• Precision BSP Threading: The 1-inch female BSP thread is cleanly moulded to exact tolerances. This ensures a smooth, cross-thread-resistant connection when screwing onto brass or plastic male fittings.
• Tool-Free Easy-Fit Compression: Connecting your 25mm poly pipe is incredibly straightforward. Simply slacken the nut, push your MDPE pipe straight past the internal rubber O-ring until it seats at the back of the chamber, and tighten by hand.
• Industrial Pull-Out Resistance: The internal polyacetal split-ring collet bites firmly onto the outside of the pipe. This prevents blow-outs or shifting caused by systemic water hammer, pump vibrations, or seasonal temperature fluctuations.
• Fully Reusable Mechanics: If you need to reconfigure your pump station or alter your garden zone layout, the compression side can be effortlessly unscrewed and reused without degrading the components.

Primary Applications

This versatile 25mm to 1 inch female adaptor is a staple component in modern water management layouts. It is most commonly used for:

• Connecting a 25mm MDPE supply line directly onto a 1″ male threaded irrigation solenoid valve or manifold.
• Adapting water pump inlets and outlets to standard 25mm poly piping systems.
• Installing heavy-duty washdown taps, backflow preventers, and inline water filtration systems.
• Connecting agricultural header pipes to male-threaded tank connectors or ball valves.

Professional Installation Tips for a Leak-Free Seal

To get the absolute best performance out of your 25mm to 1 inch female adaptor, follow these standard trade practices:

1. Prep the Thread: Always apply a generous amount of PTFE tape to the matching male thread before screwing on the female side to ensure a perfect watertight seal.
2. Avoid Over-Tightening: When connecting plastic threads to metal threads, tighten until firm, then add a final quarter turn. Over-tightening can stress the plastic housing.
3. Cut the Pipe Square: Ensure your 25mm MDPE pipe is cut cleanly with a dedicated pipe cutter. A jagged or angled cut can unevenly press against the internal O-ring seal.
4. Seat the Pipe Fully: Push the pipe firmly past the initial resistance point. This ensures it has cleared the rubber gasket and is fully engaged inside the fitting.

Technical Specification

• Product Type: Straight Female Compression Adaptor
• Fitting Connections: 25mm Compression Socket x 1″ Female BSP Thread
• Pressure Class: PN10 / 10 Bar maximum working pressure
• Material Composition: High-grade Polypropylene (PP-B) body with an ultra-tough Polyacetal split-ring
• Compatibility: Fully compatible with standard UK 25mm MDPE, HDPE, and all standard 1″ male BSP threaded components