Description Powermate tank drain valve is part of the large line of Powermate genuine replacement parts. Use the tank drain valve to replace the worn, leaky drain valve on the compressor. New Powermate tank drain valve will help prevent air leakage and water leakage when not draining the compressor.1/4 in. NPTThumbscrew stylePowermate drain tank valve creates snug fit to prevent unwanted air or water seepageDrain tank regularly for optimal compressor performance