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Topic: Thread sealant on Manibloc lines (Read 1207 times) previous topic - next topic

Thread sealant on Manibloc lines

Just replaced all the red and blue (hot/cold) valves with new valves on the manibloc, cause one of the "diamond" shaped knobs broke.
My question is do you put thread sealant on them when re attaching them ( i know tape thread sealant is a no no)  and what kind do you use if indeed you use it on the plastic fitting. Any suggestions would be appreciated.
Peter    Alberta Canada
'98 U320 40'  Build 5359 M11 450 HP, Aqua hot, Blu Ox

Re: Thead sealanton Manibloc lines

Reply #1 –

I have been using this for a while now.  I like it! Rectorseal 31631 1/4 Pint Brush Top Tru-Blu Pipe Thread Sealant
Rectorseal 31631 1/4 Pint Brush Top Tru-Blu Pipe Thread Sealant - Pipe Dope...

One can wil last a long time.

You don't need anything on the threaded end where the PEX fitting connects.

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Roger Engdahl and Susan Green
2001 U320 3610 #5879 (Home2) - 2014 Jeep Cherokee or 2018 F150
Hastings, MN

Re: Thead sealanton Manibloc lines

Reply #2 –
I did not put anything on mine.

Rich
Rich and Peggy Bowman
2002 U270 3610 WTFS, build #5939--"Freedom"
2022 Jeep Grand Cherokee Summit 4xe
SMI AirForceOne brake system
PakCanoe 15

Re: Thead sealanton Manibloc lines

Reply #3 –
White Permatex with Teflon.
1994 U280, Build 4490
Deming, NM.

Re: Thead sealanton Manibloc lines

Reply #4 –
The RV tech that did mine used Teflon water pipe sealant (not tape). Been working well for three years. Stuff Roger recommended would also be a proven sealant. My Manablock had a crack so total replacement.
1998 36 foot U270 Build No. 5328 WTFE, 900 watts solar, Victron controller, B2B, bat monitor, 600 AMPH lithium with 2018 Chevy Colorado toad, SKP #110239, Motorcade #17781, 2021 Escape 17B for when Coach is broken down and campsites are too small, retired and full-timer since Dec. 2020. Part of RV family since 1963.

Re: Thead sealanton Manibloc lines

Reply #5 –
If by "re attaching" you mean the Pex lines going to each fixture, they should incorporate a cone washer that does the sealing.

Re: Thead sealanton Manibloc lines

Reply #6 –
I would replace the cone washers- I always replace them if fitting has been in place for a while--I have had problems in the past when reusing fittings with old cone washers.  They are not easy to find but you can get them on amazon                                                    Cirque Bg/10 1/2" Saniprene Seal 06435
I just got some to replace on some fittings I was working with
Chris
1999 U 320 DGFE
Build Number 5523
Chris & Elka Lang
In the field, Lonoke AR

Re: Thead sealanton Manibloc lines

Reply #7 –
Quote from: Chris m lang –
I would replace the cone washers- I always replace them if fitting has been in place for a while--I have had problems in the past when reusing fittings with old cone washers.  They are not easy to find but you can get them on amazon                                                    Cirque Bg/10 1/2" Saniprene Seal 06435
I just got some to replace on some fittings I was working with
Chris
Amazon.com: Cirque Bg/10 1/2" Saniprene Seal 06435: Home Improvement

https://www.supplyhouse.com/Viega-43721-VIEGA-1-2-PureFlow-Cone-Seal?gclid=CjwKCAjwgOGCBhAlEiwA7FUXklNAOaIeF6OKD2CFc2eAodwL7V5mDPgmsuIGSqZIkbyBptDBvVOyXBoC2z4QAvD_BwE    29 cents each rather than a dollar
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Re: Thead sealanton Manibloc lines

Reply #8 –
New cone washers on mine never any thread sealant. If you have a leak with new washers, look for cracked fitting or leaking line connection
Bruce, Linda, and Macy
Zoey RIP 1/20/19
1999 U295 40' build #5400
2017 silver Jeep Wrangler, 1260 watts of solar on top
Moving around the country

Re: Thead sealanton Manibloc lines

Reply #9 –
I also replaced my cone washers. The old one were deformed from age.
1998 36 foot U270 Build No. 5328 WTFE, 900 watts solar, Victron controller, B2B, bat monitor, 600 AMPH lithium with 2018 Chevy Colorado toad, SKP #110239, Motorcade #17781, 2021 Escape 17B for when Coach is broken down and campsites are too small, retired and full-timer since Dec. 2020. Part of RV family since 1963.

Re: Thead sealanton Manibloc lines

Reply #10 –

No sealant, just silicone grease on the rubber cone, and DON"T overtighten!!!

HOWEVER, before you twist off one of your manabloc valve diamond thingys, and you eventually will....order one of these. 

Viega 50602 PureFlow Zero Lead Manabloc Valve Stem Replacement Kit Red and...

They fit the old manablocs perfectly and even comes with a handle and a tool to pop the old valve body out and you just snap in the new one.  I also got several 3 pack valve bodies on Amazon, without the tools and will eventually replace all of them.  Woody.

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2001 4010 U320 build #5865 "Bluto-d-Bus" since 09/18
2006 Honda Element ESP Toad
Full timing since 2016 in Western MT
Copilot: Sitka
1975 GMC 260 Avion: sold

Re: Thread sealant on Manibloc lines

Reply #11 –
before I get started replacing the cone washers, mine are in pretty rough shape, can someone explain which way to install them? small end towards the hose or large end?
Peter    Alberta Canada
'98 U320 40'  Build 5359 M11 450 HP, Aqua hot, Blu Ox

Re: Thread sealant on Manibloc lines

Reply #12 –
Re-plumbed my entire house several years back with pex and manifold. Use no sealant at manifold. Used sharkbites at fixtures. Not one problem.
2001 4010 U320
Build 5875

Re: Thread sealant on Manibloc lines

Reply #13 –
Large end goes in first said another way when it is in and you look at the hose in your hand you should be looking at the taper end
Chris
1999 U 320 DGFE
Build Number 5523
Chris & Elka Lang
In the field, Lonoke AR

Re: Thread sealant on Manibloc lines

Reply #14 –
Chris M Lang...thanks for the help!!
Peter    Alberta Canada
'98 U320 40'  Build 5359 M11 450 HP, Aqua hot, Blu Ox