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Thread: Watts 800M4QT blowout fitting

  1. #1
    DIY Junior Member
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    Default Watts 800M4QT blowout fitting

    Ok, you can make not only my day, but my entire year here if you answer this.

    I am looking for the proper fitting to connect to a Watts 800M4QT to standard 1/4" air compressor fitting.

    I'm trying to blow out my sprinkler system and the test cocks included on this unit are of such a size that nobody has the parts to hook an air compressor up to it.

    I need help finding the right parts!!

    Thanks in advance,
    Scott

  2. #2
    Plumbing Contractor for 49 years johnjh2o1's Avatar
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    The test cock is 1/4". Just screw your fitting in to the test cock. Where the test cock connects to the device it is 1/8".

    John

  3. #3
    In the Trades Gary Swart's Avatar
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    Likely the best fitting to start with is a 1/4" street elbow. You can go from there by just screwing nipples, adapters, etc hand tight.

  4. #4
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    I don't believe any of those sizes are correct.

    I could find nothing standard to fit it at home depot.

    It took 3-4 adaptors to get it to convert, but they don't stay together ... and when I hand tightened it ... the inner piece got stuck in the backflow part and it took an hour to get it back out with vise grips.

    They must be a solution which is a single fitting, right?

    I can't image that jerry rigging this is the correct answer, is it?

    Why do they put these useless test cocks on there, when they only thing I (as the homeowner) needs to do is blow the systerm out once per year ?!

    When I had a febco backflow, I could just insert a standard fitting and that was it. But with the watts its some idiotic 3/8 with different threads or something ...

  5. #5
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    John, I'll have to check and see if mine really is 1/8 to 1/4 ... I see it shows thats on the website.

    What is a 1/4" street elbow?

    There is a part which the stores carry to blow out these things and I know that one doesn't fit mine.

  6. #6
    In the Trades Gary Swart's Avatar
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    A street elbow is an elbow that has male threads on one end and female on the other.

  7. #7
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    The closest Home Depot had was a 1/8" extension which I could then connect to a 1/8 to 1/4 adaptor, then hook a 1/4" fitting for the air compressor.
    But I have to remove the entire test cock and use this instead. Not the most elegant solution.

    The problem with the test cock on my 800M4QT is that they are NOT 1/4" ... they are larger, probably 3/8" .

    This looks like what I probably needed:
    http://www.farm-home.com/mn/v11_cata...95-2328~~~~~~~
    Last edited by bunkers; 10-19-2009 at 09:11 PM.

  8. #8
    DIY Junior Member cn90's Avatar
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    For those who want to connect Air Compressor to Hose Bib, here is the setup I use (cost about $8 to put it together):

    - Part 1 is the standard 1/4" Air Compressor fitting
    - Part 2 is Adaptor to go from 1/2" (Female end of the Hose Coupling #3) to 1/4"
    - Part 3 is Hose Coupling.
    Ace Hardware PN 71941
    http://www.acetogo.com/product/71941...fhtx12fip.html


    Use Teflon and you are good to go.


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