Adapter to fit High Pressure Filter Port on Meyer Plow Pumps. Will NOT fit older E-47 units that have 5/8" plugs. Fits E-47, E-57, E-58H, E-60, E-78, E-68, E-88. Also fits H Models. Other end of adapter has 1/4" NPT. If you use an 11/16" wrench to remove the drain and filter plugs on the front of your Meyer plow pump, this adapter will fit. The other end has 1/4" National Pipe Thread. THIS is the adapter you need if you want to switch an E-58H to old style Pin Type Couplers. SOLD EACH.