Test Plug Air Connection Gender Female Air Connection Size 19/32 in Air Connection Type NPT Body Surface Style Smooth Deflated Diameter 2.5 in Deflated Length 23.5 in For Maximum Pipe Inside Diameter 4 in For Maximum Pipe Size 4 in For Minimum Pipe Inside Diameter 0.38 in For Minimum Pipe Size 3 in Head Tether Connection Handle and Strap Inflated Length 22.5 in Maximum Back Pressure (Air) 56 psi Maximum Back Pressure (Water) 30 ft of head Number of Inflation Chambers 1