1/2" BSP Tap Connector (300mm) with built-in Isolating Valve allowing easy pump removal whilst in circuit.
Half inch BSP fits the pump inlet and outlet.
The other end is 15mm female compression joint to fit standard male 15mm copper or plastic pipework.
£4.95 each (NB a pair is required to manage both inlet and outlet ports!)
Check valve, Prevents reverse flow in a circuit. 15mm female compression fittings.
This prevents unwanted flow in either direction unless pumped to create sufficient pressure to open the spring loaded valve.