R24/LR non return valve assembly

This assembly comprises four components;

the brass housing for the NRV, the brass jumper, the green o-ring that fits onto the brass jumper, and the spring that pushes the brass jumper down against the machined face inside the brass housing

Undo with a 17mm wrench. Do not use adjustable wrenches, water pump pliers, or vice grips as you will ruin every nut on the machine

Use a 19mm wrench on the nut on the bottom of the manifold to brace against the torque generated when you use the 17mm wrench or you will tear the manifold off its bracket and bend copper pipes

The pressure hose connection on the bottom of this valve is 1/8"BSP male and is therefore unsuitable for the Compressa and the commercial L1/2/3 machines