A17038 Air Compressor Tank Drain Cock 1/4" NPT Porter Cable Craftsman Dewalt Air Compressor Tank Drain Cock 1/4" NPT New Improved Design for Extended Service Life. Thumb Screw with Positive O-Ring Seal. Gently tighten to seal. 1/4" NPT Male Pipe Threads For Porter Cable, Dewalt, Craftsman, Devilbiss, Emglo, Ridgid, Jenny, Quincy, Rol-Air, J-Air and Mos