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- Caleffi Drain Valve, Series: 538, 1/2x3/4 in Nominal, NPTxGarden Hose Thread, 150 psi, 250 deg F, Brass Body
- Boiler drain valve
- 1/2 in NPT replacement drain valve fits Hydro Separator Series 548, HydroLink™ Series 559 and DIRTCAL® Series 5462
- 1/2 in NPT replacement drain valve fits FlowCal™ series 120
- 3/4 in garden hose thread (GHT) with cap
- Body MaterialBRASSEnd StyleNPT x Garden Hose ThreadNominal Size1/2 x 3/4 inPressure Rating150 psiManufacturerCaleffiManufacturer #538402 FDSeries538Temperature Rating250 deg F