Spirax Sarco Brass Sight Glass Check Valve, BSPP 1/2in, 3.5 bar

Used to detect and inspect the flow of individual fluids, blocked valves or strainers or leakage of live steam through steam traps.

Inspect colour
Identify vapour leakage
Detect blocked flow
Assess correct flow indication

This product is a sight glass only, not including the fitting, they’re just the fitting for reference that the product goes with.