1/4" Air Compressor Tank Drain Valve – Pull Style Moisture Release – DM251 4" Air Compressor Heavy Duty Tank Moisture Brass Pull Drain Valve USA Made Heavy duty 1 4" Male NPT pull style air tank moisture drain with 36" poly coated steel cable. This is a high quality, solid brass, pull style drain that can be used to replace any standard 1 4" drain or petcock. This is similar to other drains of this type; however, this drain features a heavy duty, large brass body, as well as a thicker steel cable with a durable poly