Coupler, Connection Size 1: 4 in, Connection Type 1: Type D, Connection Size 2: 4 in, Connection Type 2: FNPT, Aluminum, 3.6 in ID x 6.56 in OD x 3.9 in L, Maximum Operating Pressure: 150 psi, Additional Information: 10.66 in OD Cam Arms Extended, 2.484 lb Weight, HBS 300 Series Stainless Steel Cam Arm