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Foretravel Motorhome Forums => Foretravel Tech Talk => Topic started by: Peter on March 21, 2021, 01:43:40 pm

Title: Thread sealant on Manibloc lines
Post by: Peter on March 21, 2021, 01:43:40 pm
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.
Title: Re: Thead sealanton Manibloc lines
Post by: Roger & Susan in Home2 on March 21, 2021, 02:09:59 pm
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... (https://amazon.com/gp/product/B0012YO0Z4/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1)

One can wil last a long time.

You don't need anything on the threaded end where the PEX fitting connects.
Title: Re: Thead sealanton Manibloc lines
Post by: Rich Bowman on March 21, 2021, 02:13:12 pm
I did not put anything on mine.

Rich
Title: Re: Thead sealanton Manibloc lines
Post by: Twig on March 21, 2021, 02:14:53 pm
White Permatex with Teflon.
Title: Re: Thead sealanton Manibloc lines
Post by: Realmccoy on March 21, 2021, 02:20:38 pm
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.
Title: Re: Thead sealanton Manibloc lines
Post by: Travelin' Man (RIP) on March 21, 2021, 02:26:46 pm
If by "re attaching" you mean the Pex lines going to each fixture, they should incorporate a cone washer that does the sealing.
Title: Re: Thead sealanton Manibloc lines
Post by: Chris m lang on March 21, 2021, 03:48:21 pm
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
Title: Re: Thead sealanton Manibloc lines
Post by: dsd on March 21, 2021, 05:58:11 pm
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.amazon.com/Cirque-Bg-Saniprene-Seal-06435/dp/B0064DSDVK/ref=sr_1_2?dchild=1&keywords=Seal+06435&qid=1616363832&sr=8-2)

https://www.supplyhouse.com/Viega-43721-VIEGA-1-2-PureFlow-Cone-Seal?gclid=CjwKCAjwgOGCBhAlEiwA7FUXklNAOaIeF6OKD2CFc2eAodwL7V5mDPgmsuIGSqZIkbyBptDBvVOyXBoC2z4QAvD_BwE    29 cents each rather than a dollar
Title: Re: Thead sealanton Manibloc lines
Post by: bbeane on March 21, 2021, 06:09:14 pm
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
Title: Re: Thead sealanton Manibloc lines
Post by: Realmccoy on March 21, 2021, 10:06:40 pm
I also replaced my cone washers. The old one were deformed from age.
Title: Re: Thead sealanton Manibloc lines
Post by: Woody & Sitka on March 21, 2021, 11:45:05 pm
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... (https://www.amazon.com/gp/product/B008J31Z7W/ref=ppx_yo_dt_b_asin_title_o03_s00?ie=UTF8&psc=1)

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.
Title: Re: Thread sealant on Manibloc lines
Post by: Peter on March 25, 2021, 08:30:16 pm
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?
Title: Re: Thread sealant on Manibloc lines
Post by: Spiderhitch on March 25, 2021, 08:49:35 pm
Re-plumbed my entire house several years back with pex and manifold. Use no sealant at manifold. Used sharkbites at fixtures. Not one problem.
Title: Re: Thread sealant on Manibloc lines
Post by: Chris m lang on March 25, 2021, 08:50:17 pm
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
Title: Re: Thread sealant on Manibloc lines
Post by: Peter on March 25, 2021, 09:23:44 pm
Chris M Lang...thanks for the help!!
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