Check the listing for details. Two 1/4" Air Compressor Tank Moisture Brass Pull Drain Valve High Quality USA. Condition: New, Made in United States. Listed at 20.95 USD. Set of 2 brand new 1/4" Male NPT pull style air tank moisture drains with 60" poly-coated steel cables. These are high-quality, solid brass, pull-style drains that can be used to replace any standard 1/4" drain or petcock. These screw into the threads on the bottom of your tank, with this style of drain; however, you do not have to get on the ground and manually twist it open to release the moisture. All you do is pull on the cable and the unique design of the valve releases air pressure and moisture. When you release the cable the drain valve automatically seals itself and does not let any air pass through.