This is a BRAND NEW Ugraded White Rodgers Slow Opening Gas Valve. It is designed to replace old White Rodgers part #s 36E97-203 36E97203 36J23-502 36J23502 & 36E97-206. It works in both Hot Surface and Direct Spark applications. The valve is 4 5/8" long with a 1/2" in let and 1/2" outlet