Mechanical Expansion Plug Bypass Connection Size 1/4 in Bypass Connection Type Barbed Bypass Thread Gender Male For Maximum Pipe Inside Diameter 0.53 in For Minimum Pipe Inside Diameter 0.48 in For Pipe Size 1/2 in Handle Material Stainless Steel Included Water Fill Port/Hose Not Applicable Maximum Back Pressure (Air) 10 psi Maximum Back Pressure (Water) 23 ft of head Overall Height 3.22 in Padlock Shackle Diameter Not Applicable Plate Material Zinc-Plated Steel