Don't run short on air with a leaking petcock - install one of our replacement brass constructed drain petcocks on your compressor tank. Brass provides a positive seal, so no more leaks. Simply unscrew wing nut to drain water and condensation from your tank. 3/8" Pipe Thread with wing nut. Made in USA. Replacement brass constructed air compressor tank drain petcock provides a positive seal, so no more leaks.