Potterton Pressure Relief Valve 5000721 was 10/18828
This is used on the Puma Flowsure+
Ref: 5000721
Potterton P.R.V 430002/8430002
Ref: 430002
Potterton 1/2 in BSP Safety Valve 430044/8430044This is used on the Suprima 30 to 100. Envoy System 30 to 80. Envoy Flowsure and flowsure plus.
Ref: 430044
Potterton Pressure Relief Valve 430131/8430131
Ref: 430131.