Alde 12 mm John Guest Safety Drain Valve – Combined Safety and Drain Tap

Alde 12 mm John Guest Safety Drain Valve – Combined Safety and Drain Tap

The Alde 12 mm John Guest Safety Drain Valve is a combined safety valve and drain tap designed for caravan and motorhome hydronic heating or water systems. It features a 12 mm John Guest push-fit connection for semi-rigid pipework and provides both over-pressure protection and manual drainage.

Installed close to the boiler’s incoming supply, this valve helps protect the system from excessive pressure while also allowing you to drain water when servicing or winterising your caravan’s heating circuit.

Why Choose This Safety Drain Valve?

• 🛡 Combined Safety & Drain Function – Acts as a pressure relief/safety valve and a manual drain tap in one compact unit.

• 🔧 John Guest Push-Fit Connections – Quick, secure push-fit install on 12 mm semi-rigid piping.

• ⚙️ Pressure Relief Range – Opens at ~3.5–4.5 bar to protect your system from over-pressure stress.

• 💧 Easy Draining – The yellow lever permits manual draining of the system for service or winter storage.

• 🚐 Genuine Alde Part – Made for Alde heating and hot water systems to ensure correct fitment and performance.

Key Features & Specifications

What’s Included

• 1 × Alde 12 mm John Guest Safety Drain Valve – combined safety and drain unit with integrated manual drain lever.

How It Works

1. Install near the boiler’s inlet or high-point on your hydronic heating/water system using the 12 mm John Guest connection.

2. Under normal operation, the valve acts as a safety pressure relief and will open if the system exceeds ~3.5-4.5 bar.

3. For service, winterisation or draining, push up the yellow lever to open the drain tap and release water from the circuit manually.

4. Release the lever to close the drain once water has drained and reseal the system.

Who It’s For

• Caravan and motorhome owners with Alde hydronic heating systems

• Service technicians or DIY users performing annual maintenance or winter draining

• Anyone needing a reliable combined safety/pressure relief and drain valve for 12 mm plumbing

Why Buy This Safety Drain Valve?

A properly functioning safety and drain valve is essential in any pressurised hydronic system. It protects against overpressure conditions while also enabling controlled draining — helping prevent damage, leaks or trapped water that could cause freeze damage in colder months. A unit with an integrated drain release saves time and complexity over having separate components.