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I’m running out of ideas to identify and replace the parts from the picture. Taken from my 2014 R5, pics show 3/8” fitting leading from pump to our head. I want to install a “T” with similar fittings to add a transom shower.

Tried: West Marine, Home Depot, local plumbing outlets, and even RV stores

Your fitting looks similar to the bag of elbows and swivel elbows I was sent with my freshwater tank kit. My fittings have a “THC” embossed on the fitting nut. THC at one time made Flair-It PEX fittings, but Flair-It is now a part of ESCO Elkhart Supply Company.

https://www.escousa.net/

https://www.flairit.com/

https://www.flairit.com/public/frontend ... 062223.pdf. PDF pages 10 thru 15

viewtopic.php?p=114581#p114581

Here is a link to to my thread. I did the same thing with my R5. Installed a T in the water line going to the head. I went to Lowe’s and bought some of the plastic tubing and used the Shark Bite fittings and bought the shower from Scandvik. Happy with how it turned out.

In cases like that, I've replaced the tubing with Pex and used SharkBite fittings.