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Flair-It's swivel adapter gives you a compatible connection point between 1/2" PEX and polybutylene tubing, which is useful since a lot of older RVs still run polybutylene lines that don't always play nice with newer parts. The swivel action lets you rotate the fitting into place without twisting the line itself.
At a small 2.5 x 1.3 x 1.1 inch footprint, it's an easy add to a plumbing repair kit for tight spaces under sinks or behind panels.
A useful adapter to have around whenever you're tying into an existing polybutylene water line.
