Pentair 2 R172061 Elbow Check Valve Replacements Rainbow Automatic Pool Feeder 2 Combination check valve and elbow replacements Comes with (2) combination check elbows Fits Pentair Rainbow automatic chlorine/bromine pool and spa feeder models 300, 302, 300-19, 300-29 Part Number: 2 x R172061 60 Day Satisfaction Guarantee