This component is intended for practical repairs on compatible Pentair equipment. The Rainbow 10" Chlorinator Extension is a Pentair/Rainbow replacement for chemical feeder service, helping helps maintain controlled sanitizer delivery. In feeder service, correctly matched small parts help manage sanitizer flow, reduce nuisance leaks, and keep maintenance more predictable. Matches compatible equipment applications that reference part number R172087. Supports original equipment function. Useful for professional service routes, facility maintenance, and well-planned homeowner repairs. Match the part to the model diagram or existing component before ordering. This part is a focused solution for chlorinator and feeder repairs, allowing the repair to address the exact wear point instead of replacing more equipment than necessary.