Gas appliance connectors coated stainless steel - excess flow valve safety+plus advantage 1/2 inches inner diameter ( 5/8 inches outer diameter) 3/4 male iron pipe x 3/4 female iron pipe bagged length = 48 inches Coated stainless steel gas connector with excess flow valve. The safety+plus flow valve is an automatic safety valve for gas designed to help prevent fires and explosions due to gas line ruptures or disconnects at the appliance. It is equipped with automatic reset and automatic valve activation. The pro coat polymer-based coating resists corrosion from harsh chemicals found inch common household cleaning, plumbing repair, and masonry products. Approved for indoor and outdoor use, the pro coat coating resists the harsh effects of the uv rays and salt. For use with residential and commercial gas appliances not subject to frequent movement that utilize natural, manufactured, mixed, liquefied-petroleum gases and lp gas-air mixtures: Residential kitchen appliances, infrared or blue-flame"hearth-style" heating units, pulse combustion furnaces, manufactured housing (permanent residence mobile homes), laundry/utility appliances, forced air heating units, and rooftop hvac units. Design-certified (assembled connector) and manufactured inch accordance with ansi z21.24, ansi z21.75, agal contract no. 8204, listed by the new york city board of standards and appeals and by the commonwealth of massachusetts division of registration. Leak tested.