Sight Plug, Body Material Brass, Connection Type Pipe Threads, Window Material Glass, Seal Material Buna-N, Reflector Material Stainless Steel, Window Features Fused Window, Reflector, For Liquid Clarity Clear, For Fluid Type Liquid, Thread Gender Male, Thread Size 1 1/2 In.-11 1/2, Hex Width 2 in, Pipe Size 1 1/2 in, Thread Type NPT, Window Diameter 1 11/25 in, Maximum Operating Pressure 25 psi, Maximum Operating Temperature 180 Degrees F, Body Material Finish Zinc Plated