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3/8 inch pex ball valves brass and plastic?

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archibald tuttle
archibald tuttle Member Posts: 1,085
in Gas Heating
veiga makes some great plastic 3/8" valves for quickie lavatory applications, e.g.

https://www.supplyhouse.com/Viega-43002-3-8-PureFlow-PolyAlloy-PEX-Crimp-x-1-2-Closet-Stop-Valve-Plastic-Nut


but instead of either 3/8 compression thread (which might be a little dicey as against brass nuts) and or simply 3/8 inch pureflow on both sides, they go right to a female wivel for 1/2" faucet supply (or another for 1/2" toilet supply). i can deal with that on a toilet because you've got access to install and to turn the valve, but up under a sink putting a basin wrench up next to it???? I'm not saying it could be done, but why?

What about a 3/8 inch straight through ball valve and then veiga also makes those same fittings as adapters. It takes an act of congress to get a 3/8" ball valve in brass and the viega number if they made it in plastic should be a 43020, cf. the 1/2" version: if they made one should be, e.g.:

https://www.supplyhouse.com/Viega-43030-1-2-PureFlow-PolyAlloy-PEX-Crimp-Stop-Valve

the orphaning of 3/8 inch just drives me crazy. so many circumstances where it is sufficient and just that much easier to run.

anyway, these are literary the only 3/8 pex ball valves i found on the internet this morning. can they be that rare? anyone got better links than me?

https://www.usplastic.com/catalog/item.aspx?itemid=143465

thanks, brian

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  • archibald tuttle
    archibald tuttle Member Posts: 1,085
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    nuttin honey? noone using 3/8 valves. understandable given availability. just checking
  • mattmia2
    mattmia2 Member Posts: 9,639
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    I am curious about how that 1/2" fitting came in to being and what will mate with it. Does it mate to any 1/2" male npt/nps fitting or is there something special about faucets and toile valves? Were they originally piped with npt pipe and the supply line was a hack? Would a 1/2" npt-m to 3/8 compression adapter attach to that valve?

    Obviously the more professional way to do this is use a copper stub out with mounting bracket so the supply under the fixture is anchored and use a compression stop or male adapter and npt-f stop.
  • archibald tuttle
    archibald tuttle Member Posts: 1,085
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    mattmia2 said:

    I am curious about how that 1/2" fitting came in to being and what will mate with it. Does it mate to any 1/2" male npt/nps fitting or is there something special about faucets and toile valves? Were they originally piped with npt pipe and the supply line was a hack? Would a 1/2" npt-m to 3/8 compression adapter attach to that valve?

    Obviously the more professional way to do this is use a copper stub out with mounting bracket so the supply under the fixture is anchored and use a compression stop or male adapter and npt-f stop.

    my experience is that the 1/2" lav adapters can handle a range of duties besides just the parallel thread and nicely beveled internal face on a faucet. They have a really generous sealing washer.

    Of course the stub outs are nice for solid mount and they are straight copper so maybe they have less issue with corrosion than some of the lead free brass fittings i've seen (about to start a thread about brass alloys and dezincification, but my preference has been not to have crimps in the wall. so what i would prefer is a stub bend with mounting plate both for wall and floor applications (for the 3/8" as well as 1/2" pex) that was designed as a sleeve mount where you crimp a stop on the end, e.g. :
    https://www.supplyhouse.com/Viega-93515-3-8-PEX-Press-Angle-Stop-Valve-Lead-Free

    in this particular application and various quick camp installs the pex is on the surface and i'm just looking for a valve to crimp in line and then the pex can continue to the swivel - obviously with a closet i'm fine with the valve that has 3/8" pex in and female closet swivel out. with lavs that format is a little tough although i'm going to try those lav adapters on the shower valve which has 1/2" male connections on this job (although, its always something, it would be more ideal in that application if they were like the 90 degree adapaters. In this setting I think i've got room to put a pipe bend in. BTW , appropos of that thought, why is it so hard to find a steel 1" bend support. Everyone wants to sell plastic, if i wanted a 75 degree bend i would have bought a 75 degree bend support :-)

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