Rainbow R172288 1.5"/2.0" In Line Corrosion Resistant Check Valve This allows the installer to

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Rainbow R172288 1.5"/2.0" In Line Corrosion Resistant Check Valve This allows the installer toRainbow 1. 5" 2. 0" Corrosion Resistant Check Valve. The Rainbow R172288 in line corrosion resistant check valve is very effective when used in conjunction with low pH chlorinators preventing back flow problems and damage. Features: Special corrosion resistant 1 1 2" & 2" slip spring check valve can be used to check back flow of fluids, air, etc. 2 pound spring. Full free flow design Special Spring and Seal for corrosive applications. Enclosed spring