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06-30-2021, 11:35 AM
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#1
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Junior Member
Join Date: May 2020
Posts: 11
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Teflon Tape on PVC drain cap or not ?
Trying to solve a slow drip from my fresh water drain cap .. I have heard both ways ... use teflon tape and don't use teflon tape. What is the correct answer?
I don't want to crack the fitting if the tape will make it too tight.
Your thoughts please.
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06-30-2021, 11:55 AM
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#2
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Senior Member
Join Date: Apr 2019
Posts: 1,957
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Quote:
Originally Posted by Mao007
Trying to solve a slow drip from my fresh water drain cap .. I have heard both ways ... use teflon tape and don't use teflon tape. What is the correct answer?
I don't want to crack the fitting if the tape will make it too tight.
Your thoughts please.
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I'm not sure what kind of drain cap you're talking about. I don't have a freshwater drain cap, I just have just a valve, and no cap on the drain tube after that.
Maybe if you post a picture it would help?
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06-30-2021, 02:26 PM
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#3
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Senior Member
Join Date: Jan 2017
Location: Titusville, FL
Posts: 5,164
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If a fitting is some size NPT then tape or dope (I like Rectorseal #5) is in order. Most other fittings have a rubber seal of some kind or use a kind of deformable metal seal (like flare or bango). I don't use anything on fittings except on NPT and maybe a little Rectorseal on a flare for lubrication.
So, until you clarify exactly what you're talking about it's difficult to make a specific recommendation.
__________________
When seconds count, the police are only minutes away.
2023 Grand Design 2600RB, 2022 F-350 King Ranch tow vehicle, Titusville, FL when not on the road
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06-30-2021, 06:27 PM
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#4
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Senior Member
Join Date: Dec 2019
Posts: 797
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"Rectorseal 5" mentioned before dries and hardens some, IMHO, not ideal for a cap you want to take off and put back on (thinking draining for winterization).
If you look for "Rectorseal T plus 2", it is a white Teflon dope that brushes on and never hardens and is safe for potable water. Won't have to worry about cracking the cap like you are with Teflon tape, and it won't be hard to take off when it comes time to drain for winterization.
https://www.amazon.com/Rectorseal-23...+T+plus&sr=8-2
FYI, I found it cheaper at Lowe's than on Amazon.
Edit to add: I've seen some of the caps like you describe have a rubber seal inside just like the ones used on a garden hose. It may need to be replaced if there is one.
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07-01-2021, 11:12 AM
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#5
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Junior Member
Join Date: May 2020
Posts: 11
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I have a picture but not sure how to post it in here
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07-01-2021, 11:16 AM
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#6
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Moderator Emeritus
Newmar Owners Club
Join Date: Apr 2014
Location: Southern Indiana
Posts: 19,417
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Quote:
Originally Posted by Mao007
I have a picture but not sure how to post it in here
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Post#8 should help.
https://www.irv2.com/forums/f62/foru...tml#post477709
__________________
Steve
2002 Newmar Mountain Aire 4095
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07-01-2021, 11:18 AM
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#7
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Junior Member
Join Date: May 2020
Posts: 11
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Picture of drain plug
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07-01-2021, 11:28 AM
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#8
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Moderator Emeritus
Join Date: Jan 2000
Location: West Palm Beach, FL. USA
Posts: 27,704
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There is no downside to using the teflon, but it seems unusual to need that. Wonder if there isn't a rubber gasket inside that fitting, or at least supposed to be.
It also seems to me that tube sticking down is just begging to get broken off, costing you your onboard water supply. I'd shorten that tube as much as possible and put a shut-off valve on the end instead of a cap.
__________________
Gary Brinck
Former owner of 2004 American Tradition and several other RVs
Home is West Palm Beach, FL
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07-01-2021, 12:12 PM
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#9
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Senior Member
National RV Owners Club Workhorse Chassis Owner
Join Date: May 2000
Location: California Central Coast
Posts: 2,034
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I'm with Gary on that one, shorten it and add a ball valve. Your looking for problems with that setup.
Glenn
__________________
2006 Sea Breeze LX 8341 on a Workhorse W22 Chassis with 22.5 Alcoa Alum wheels,
2011 Chevy Colorado 4X4 with Ready Brake
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07-01-2021, 12:15 PM
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#10
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Senior Member
Join Date: Oct 2014
Posts: 7,882
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Quote:
Originally Posted by Gary RVRoamer
It also seems to me that tube sticking down is just begging to get broken off, costing you your onboard water supply. I'd shorten that tube as much as possible and put a shut-off valve on the end instead of a cap.
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YUP, best answer.
__________________
Brett Wolfe
Ex: 2003 Alpine 38FDDS. Ex: 1997 Safari Sahara. Ex: 1993 Foretravel U240
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07-01-2021, 12:40 PM
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#11
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Senior Member
Join Date: Feb 2015
Location: Grapevine, Tx
Posts: 5,634
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Actually, I think I'd put a 90 elbow up close to the foam and then put a ball valve on it.
__________________
2004 Fleetwood Southwind 32VS W20 - SOLD!
ReadyBrute Elite towing a 2017 Ford Edge Sport
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07-01-2021, 12:57 PM
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#12
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Senior Member
Join Date: Jan 2018
Location: Capistrano Beach, California
Posts: 4,465
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That does look to be the fitting that holds all the water in the fresh tank. Appears to be nylon, both plug and female connector. Doesn't look to be a plug that uses an O-ring to seal.
Absolutely agree with all the others that a securely closing valve should be added as close to the underside as possible. Cutting away some foam spray insulation for closer tolerance could be done.
__________________
Larry, Eileen, and Finley
2004 Alpine 36FDDS
Third motor home, first Alpine, no need for another.
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07-01-2021, 01:15 PM
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#13
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Junior Member
Join Date: May 2020
Posts: 11
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Thanks for all the input .. that is just how it came from the factory ..
What kind of valve are you referring to?
Brass or PVC ?
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07-01-2021, 02:12 PM
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#14
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Senior Member
Join Date: Nov 2015
Posts: 26,843
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That drain line is typical on trailers.......never heard on one yet that got broken off
If trailer is going over that kind of obstacles....other damages would be happening
Many times folks do MOD by installing a 90* elbow....run line out to side of trailer with shutoff valve and support straps so they don't have to crawl underneath trailer/get wet anymore
FlairFit, Sharkbite, Gatorbite valves/fittings
Plumbers tape for support straps...self taping screws to attach
__________________
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Dodge 3500 w/Tractor Motor
US NAVY---USS Decatur DDG-31
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