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Old 05-20-2015, 08:37 AM   #1
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Low point Water Drain Cap Lost

What is the proper replacement for this cap? I went to the hardware store and bought the 1/2" PVC white threaded cap, but it does not fit the same and leaks unless i put on thread tape and tighten with pliers...

thanks for the advice.
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Old 05-20-2015, 09:02 AM   #2
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I recommend replacing with a 1/2" PVC gate (ball) valve. You'll need 3 if you do then all.
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Old 05-20-2015, 09:26 AM   #3
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Like said, more convenient in the long run to just replace the caps with a ball valve. The older water line fittings that your cap fell off from are generally not stocked at hardware stores so you have to make a trip to any dealer to get them. They are not just a simple pipe thread cap as you discovered. Many RV manufaturers have gone to the PEX fittings with the metal band that holds the line to the ftg.
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Old 05-20-2015, 10:27 AM   #4
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Yes, it is the PEX with the metal band. I just did not see a PEX cap at the hardware store. Ball valve is an interesting idea.
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Old 05-20-2015, 11:02 AM   #5
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What is the proper replacement for this cap? I went to the hardware store and bought the 1/2" PVC white threaded cap, but it does not fit the same and leaks unless i put on thread tape and tighten with pliers...

thanks for the advice.
The original caps are pretty much an RV thing. They have an integral washer, where a 1/2" cap won't and will need tape or an additional washer. I replaced two caps at the local RV shop before I decided it was a waste of time, effort and my lower back. I now have these from Lowes.
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Old 05-20-2015, 11:13 AM   #6
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I think these are the caps. Viega 36205 PureFlow 1/2-Inch Zero Lead Manabloc Port Safety Cap, 6-Pack - Pipe Fittings - Amazon.com

But, Im going to do the valve. I like that idea!!!
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Old 05-20-2015, 11:15 AM   #7
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PS You do have to use water rated tape when you install the valve, but then on it is just a turn of the handle.


PPS I should have provided this:
http://www.lowes.com/pd_21481-34146-...&storeId=10151
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Old 05-20-2015, 11:18 AM   #8
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MadMax, do you just attach the ball valve to the pex using regular PVC pipe cement? Or is there another method? Thanks
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Old 05-20-2015, 11:21 AM   #9
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MadMax, do you just attach the ball valve to the pex using regular PVC pipe cement? Or is there another method? Thanks
Use thread tape on the threads, the ball valves are threaded.

You can see that here.
Threaded PVC Ball Valve | QC Supply
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Old 05-20-2015, 11:26 AM   #10
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Thanks Ford, I wasnt sure if this was an operation where I just screw the valve onto the existing pex pipe, or if I had to remove everything to just the bare pipe (or maybe hose? lol) and attach with glue like I would for pvc pipe joints. The tape methos is preferred. Appreciate the clarification
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