Plug with Bypass Bypass Connection Size 3/4 in Bypass Connection Type NPT Bypass Thread Gender Male For Maximum Pipe Inside Diameter 18.3 in For Minimum Pipe Inside Diameter 17.7 in For Pipe Size 18 in Handle Material Zinc-Plated Steel Included Water Fill Port/Hose Not Included Maximum Back Pressure (Air) 8.7 psi Maximum Back Pressure (Water) 20 ft of head Overall Height 9.7 in Padlock Shackle Diameter Not Applicable Plate Material Aluminum Plug Seal Location Inside Pipe