Double Wall Sight Flow Indicator, Pipe Size 2 in, Connection Type FNPT, Connection Material Polypropylene, Sight Material Acrylic/Pyrex, Sight Length 3 1/8 in, Overall Length 7 3/8 in, Max. Pressure 50 psi, Temp. Range 32 Degrees F to 180 Degrees F, Viton Seal Material, Stainless Steel Bolt Material