Image AG-Series Ball Plug Product Options Part Number Length Maximum OD Body Size Thread Thread Size Material RD-AG4OF4 1.95" (49.5 mm) 1.21" (30.7 mm) Female ORB 3/4"-16 Steel RD-AG4F4 1.95" (49.5 mm) 1.21" (30.7 mm) 1/2" Female NPTF 1/2"-14 Steel