1/2" M.I.P. Safety+PLUS x 1/2" M.I.P. Use with low demand residential and commercial gas appliances not subject to frequent movement that consume up to 48,000 BTU's at maximum capacity (see package for details). CSA approved for indoor and outdoor use. Safety+PLUS excess flow valves protect 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.