LIVE STEAM LOCOMOTIVE, PRECISION BRASS DRAIN COCK RELIEF VALVE FOR 5/32" 40 TPI THREADSLive Steam Precision for use as a drain on numerous pieces of equipment as well as steam. Very handy valve to have on hand for any project. Just at 53/64" long and 3/4" tall this is a quality bit of brass machine work . Rated for 60 psig and uses a 1/4" wrench on the base hex for easy installation. Must have train part for 3/4" or 1" scale or small 1 1/2" as well as 2 1/2" and 3" scale steamers. For small air receivers and water gauge drains. Please Note that the Stainless Steel Ruler in the picture is for reference of size only and is not part of this sale, thank you. This works for all ages to enjoy! Thanks for your interest!