Each features a rugged, lightweight Lexan™ hood, a stainless-steel valve system, and a chrome-plated, solid-brass base with a DISS fitting. Tapered inner flow tube for accurate flow rates, bold calibrations, large float for easy reading, and a replaceable flowmeter needle valve. Calibrated for 50 psi. Inlet pressure at 70°F and 760-mm Hg.