Replace for R172052. This automatic feeder cap wrench is only used to loosen the cap. Just tighten only by hand when installing the cap. 1pcs R172052 Cap Lid Wrench Tool. This cap wrench fits for rainbow automatic Chlorine/bromine in-line pool and spa feeder models 300, 302, 320, 322, 300-19, 300-29, 300-29X.
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