1960-87 GM 5/16 Transmission line, 1/4"-NPT Male x 1/2"-20 Adapter Fittings Washers 4pc set. These are the straight pipe thread fittings that screw into the automatic transmission to accept the transmission cooler hard lines. These are used on all gm cars for the Power Glide, T- and the T-350 trans. If the old ones are missing or cross threaded the trans cooler lines will never seal right. The are exact to the factory originals and have the seal washer that seals the fitting to the and the in the female end to accept the flare of the tubing. These are straight pipe thread - just like the originals.