Differential pressure by-pass valve. Union connections: 3/4" MNPT union inlet x 3/4" MNPT union outlet, 3/4" union press inlet x 3/4" union press outlet, 3/4" sweat union inlet x 3/4" sweat union outlet, 1" FNPT inlet x 1" MNPT union outlet, 1" FNPT inlet x 1" sweat union outlet, 1-1/4" FNPT inlet x 1-1/4" MNPT union outlet and 1-1/4" FNPT inlet x 1-1/4" sweat union outlet. Brass body. Brass valve plug. EPDM valve plug gasket. EPDM O-Ring seals. Asbestos free NBR union seals. ABS control knob. Stainless steel spring. Suitable fluids: water, or 30% glycol solution. Temperature range 32 to 230°F (0 to 110°C). Maximum working pressure 150 psi (10 bar). Setting range is 1 to 6 m w.g. (2 to 10 psi) and flow rates 3/4" flow up to 9 gpm, 1" flow up to 40 gpm and 1-1/4" flow up to 45 gpm.
PLEASE download from "technical description" on this page the Revit Content Instruction Guide to aid in understanding what is in the Revit family and how to select various available options.