Test Plug Air Connection Gender Female Air Connection Size 25/64 in Air Connection Type NPT Body Surface Style Smooth Deflated Diameter 3.5 in Deflated Length 12 in For Maximum Pipe Inside Diameter 6 in For Maximum Pipe Size 6 in For Minimum Pipe Inside Diameter 0.38 in For Minimum Pipe Size 4 in Head Tether Connection Handle and Strap Inflated Length 14.5 in Maximum Back Pressure (Air) 37 psi Maximum Back Pressure (Water) 30 ft of head Number of Inflation Chambers 1