When I removed my outdoor kitchen this past fall I used two plastic threaded plugs on my cold/hot threaded female connectors. But, what I found in doing so can effect winterizing/de-winterizing...., possibility of trapped water or anti-freeze if your not careful.
In my case I noticed after de-winterizing/flushing my system once in Texas over the following days I could see a very slight tint of 'pink' in my bathroom water....., decided to pull the plugs from the female connectors and both lines still had antifreeze in them! Apparently the antifreeze didn't flush out with the rest of the system but was "gradually" working it's way back into the system.
I ended up removing the plastic plugs and installed two plastic on/off valves, avoids removing the plugs each time I winterize/de-winterize...., just open the valve and drain.
I didn't want to remove the hot/cold PEX water lines in question in the event of re-installing the kitchen should I sell the TT.
Bob
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2016 GM 2500HD 6.0L/4.10
2018 Jay Flight 24RBS
2002 GM 2500HD 6.0L/4:10 (retired)
2005 Jayco Eagle 278FBS (retired)
1999 Jayco Eagle 246FB (retired)
Reese HP Dual Cam (Strait-Line)