This is a Flextron gas connector from their SS12 series of connectors, which is designed for indoor and outdoor use with gas ranges and furnaces. it has an outer diameter of 5/8" and an inner diameter of 1/2" and is made of uncoated stainless steel. on the ends of this 72" long connecter are two 3/4" fip fittings, made of zinc-plated stainless steel type s45c. the connector is rated for use in the temperature range of -40 f to 150 f and it is certified by csa for use up to a pressure of 0.5 psi. please consult the product information for the flow capacity for this part, for natural gas. the part is certified by commonwealth of Massachusetts, the city of new York and by upc and csa for meeting the amse A112.18.6 and ansi Z21.24, Z21.69 and Z21.75 gas appliances and manufactured homes standards. each connector is 100% tested on leaks before it leaves the factory. the design has been tested on strength and it can withstand an internal hydrostatic pressure of 250 psi or 17 mpa without bursting or showing signs of leaks. it can also endure up to 30 bends without leaks in water at a depth of maximum 2 inches and withstands 15 twists of 90 degrees, without showing signs of corrosion. its flared end fittings result in a metal to metal seal, which is tested to be leak free within a tighten torque of 1040 inch-pounds. the connector can handle external temperatures of 800 f.72" Flexible Stainless Steel Gas Line Connector With 5/8" Outer Diameter And 0.75" Fip X 0.75" Fip Fittings