Use with large demand residential, RV/mobile home, and commercial gas appliances not subject to frequent movement Not to exceed 75,000 and 135,000 BTUs at maximum capacity CSA approved for indoor and outdoor use as well as for mobile home cross-over and foundation-to-gas supply connections The Safety+PLUS excess flow valve protects the home from fires and explosions due to gas line ruptures and disconnects at the appliance ProCoat polymer coating resists corrosion due to harsh chemical residue and vapor exposure in common household cleaning, plumbing repair, and masonry products Approved and listed by CSA and IAPMO to ANSI Z21.24, ANSI Z21.75. and CSA 3-92 Not recommended for infrared radiant tube heating systems 1/2 M.I.P. Safety+PLUS x 1/2 M.I.P. x 48 Bagged