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10-04-2019, 11:06 AM
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#1
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Senior Member
National RV Owners Club
Join Date: Feb 2018
Location: Tumwater, Wa
Posts: 225
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Grey water drain valve RX advice
I replaced 1 1/2" water valve on my grey water tank and it leaks. I'm sure I must have squished the gaskets somehow. Is there any reason why I can't use a little glue, or grease to hold the gaskets in place, before sliding the valve in between the pipes? New at this repair stuff. Thanks
Ed Mc
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Ed Mc
Nam vet '66-'67
USMC 2001 Sea View
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10-04-2019, 11:12 AM
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#2
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Senior Member
Join Date: Dec 2017
Posts: 1,251
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Try lubricating any rubber seals with petroleum jelly first, they are not really designed for sealant use.
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Rick Goodrum
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10-04-2019, 01:41 PM
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#3
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Senior Member
Join Date: Jun 2014
Location: Gulf Coast, Alabama
Posts: 2,450
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Use a hand tool to tighten the 8mm nuts; don't use a ratchet, because it can give too much leverage.
Tighten a few turns at a time all around the 4 nuts rather than tightening one, then going to the second one, etc. This will give a snug fit.
Tighten them snug, not as tight as you can. You can always add an extra turn if you notice weeping.
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Rick and Sandy
2003 American Eagle, 59K miles
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10-04-2019, 02:15 PM
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#4
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Senior Member
Join Date: Jul 2010
Posts: 5,332
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Quote:
Originally Posted by Ucbyrickg
Try lubricating any rubber seals with petroleum jelly first, they are not really designed for sealant use.
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Agree with the P-Jelly. It should provide enough stick-em to keep them in place.
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Tom
2016 Newmar Bay Star Sport 3004
2021 Jeep Gladiator Sport Willys
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10-04-2019, 02:22 PM
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#5
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Senior Member
Join Date: Apr 2019
Location: Arisona
Posts: 703
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Use silicone based plumbers grease as petroleum based products not recommended for "O" rings (breaks them down and they stretch).
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2023 GD Imagine XLS 23LDE 2022 Ford F-150
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10-04-2019, 02:23 PM
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#6
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Senior Member
Monaco Owners Club
Join Date: Oct 2014
Location: Rigby, Idaho
Posts: 3,936
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Quote:
Originally Posted by Reacher
Use silicone based plumbers grease as petroleum based products not recommended for "O" rings (breaks them down and they stretch).
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yeppers
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Cheers,
TonyMac
2006 Monaco Safari Cheetah 40PMT
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10-04-2019, 04:04 PM
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#7
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Senior Member
Join Date: Dec 2017
Posts: 1,251
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If you want to purchase plumbing grease it will do the same, i’m not sold on Vaseline deteriorating O-rings unless your O-rings are made of latex. Keep in mind your entire engine and transmission and axles are full of O-rings and rubber seals to keep petroleum products inside and they hold up just fine, but if you got six bucks to spend to protect a 29 cent O ring, plumbers grease will definitely give you no problems.
Let us know what you end up using and if any of it works.
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Rick Goodrum
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10-04-2019, 07:53 PM
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#8
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Senior Member
National RV Owners Club
Join Date: Feb 2018
Location: Tumwater, Wa
Posts: 225
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Quote:
Originally Posted by Ucbyrickg
Let us know what you end up using and if any of it works.
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Will do.........it's dark and raining right now. Will try tomorrow. I'm thinking the Vaseline first. If I have both in the garage I'll let my wife choose. Thanks All!
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Ed Mc
Nam vet '66-'67
USMC 2001 Sea View
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10-04-2019, 08:36 PM
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#9
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Senior Member
Join Date: Apr 2015
Location: Rogers, AR
Posts: 2,618
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When I had my valve out, I lubricated the slide and seals with some GM silicone grease I had. Also cover both sides of the valve with a thin plastic to keep seals in place while getting the valve positioned. That’s most likely when you got an O ring out of position.
Lightly grease the plastic surface next to the valve and just slide it out when you have the valve in position.
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2019 Fleetwood Discovery LXE 40M w/2021 Equinox
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10-04-2019, 09:03 PM
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#10
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"Formerly Diplomat Don"
Newmar Owners Club
Join Date: Apr 2005
Location: Moorpark, Ca.
Posts: 24,060
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Ed, take a plastic 1 gallon water or milk jug and cut two pieces out of the sides, a little larger than the valve. Use some grease to hold the seals in place and then sandwich the valve between the two plastic pieces. Slide the entire assembly into place. When it's centered, pull out the plastic. This prevents the seals from being dislodge during installation.
I like to use a 1/4" ratchet set so I don't over torque the nuts/bolts.
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Don & Mary
2019 Newmar Dutch Star 4018 (Freightliner)
2019 Ford Raptor
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10-05-2019, 07:49 AM
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#11
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Senior Member
Join Date: Apr 2019
Location: Arisona
Posts: 703
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Quote:
Originally Posted by Ucbyrickg
If you want to purchase plumbing grease it will do the same, i’m not sold on Vaseline deteriorating O-rings unless your O-rings are made of latex. Keep in mind your entire engine and transmission and axles are full of O-rings and rubber seals to keep petroleum products inside and they hold up just fine, but if you got six bucks to spend to protect a 29 cent O ring, plumbers grease will definitely give you no problems.
Let us know what you end up using and if any of it works.
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It's simple actually. O rings are designed and made of different materials for different purposes. Automotive and plumbing O rings are not the same, therefore requiring different lubricants.
https://www.marcorubber.com/o-ring-m...-reference.htm
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2023 GD Imagine XLS 23LDE 2022 Ford F-150
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10-05-2019, 12:22 PM
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#12
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Senior Member
Join Date: Sep 2018
Location: Fort Myers, FL
Posts: 1,687
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Quote:
Originally Posted by Ucbyrickg
Try lubricating any rubber seals with petroleum jelly first, they are not really designed for sealant use.
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To my knowledge, petroleum jelly is not advisable for any rubber or plastics.
Use silicon grease as it will not dissolve items that are made from petroleum products, such as rubber and plastic.
If I am mistaken, I welcome any correction or refinement.
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2008 Phaeton 36QSH, Safe-t-Plus, Quadra Bigfoot
2017 Jeep Cherokee Trailhawk w/ flat tow wiring mod.
Blue ox, BrakeMaster + BrakeAway, diode lights and charge.
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