AVG Pressure Temperature Relief Valve 15mm 850kPa with Extended Probe, DR Brass, WaterMark AS1357.1 PTR15 850OL 3Monkeez Commercial Tap Sets Balcony drainage pickup Balcony drainage pickup The 300mm Square Floor Waste Arrestor Bucket Trap is a heel proof floor waste fitted with a hinged grate over a fixed strainer with 4mm holes and a removable basket with 4mm holes The AVG PTR15 850OL is a 15mm pressure and temperature relief valve fitted with an extended length temperature probe The longer probe suits cylinders where the standard length probe can't reach far enough into the tank to sense temperature accurately