Go to your local hardware store and ask for a pair of Sharkbite stop valves(1/2"). Cut the PEX line straight near the outside shower connections(near where they "T" off the main lines, you have to leave 1" on the PEX to allow the Sharkbite to be attached) and pop the Sharbite valves on (they are a press fit; no wrenches required). Next time you winterize, have the valves open, then after running the antifreeze through the shower, close the Sharkbite valves. That will trap the antifreeze in the lines between the Sharkbite valves and the shower fitting. If you aren't ready to winterize yet and want them "weatherproofed" before hand, just drain the water out of the lines from the cut to the shower fitting and install the Sharkbite valves in the closed position. You'll then have air in the lines from the valves to the shower fitting and that takes care of the "winterizing" of those two lines and you won't have to worry about them when you are ready to winterize.
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My 2 cents, your mileage may vary...
Don
Bronwyn
2 Cats; J-Lo and Ragamuffin
2011 Keystone Cougar 318SAB
2011 Ram 2500 Longhorn CTD HO
Built in brake controller and exhaust brake
Tri Glide TrailAir Pinbox / B&W Companion Hitch
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