Belimo B211B+TR24-3/300 US : 2-Way 1/2" Characterized Control Valve (CCV), Cv 1.9, Chrome Plated Brass Ball and Nickel Plated Stem, Non-Spring Return Control Valve Actuator, 24VAC, 18 in-lb, On/Off, Floating Point Input, 90 Second Run Time, 10' 18 GA Plenum Cable, 5-Year Warranty