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  1. #1

    Talking Compressor Screw Valve (drain) to a ball valve?

    Craftsman 33 gallon vertical compressor, works well, but the screw valve (drain) on the bottom sucks arse big time. After only a couple of years now it leaks and is a PITA to twist in/out. I drain the tank after every use and then just leave the screw valve open...it shouldn't be rusting IMO, it just sucks.

    I've read of retrofitting it to a ball valve (using a nipple ???), but can't find any more information. Anyone done this? Tell me about it paleez?

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  2. #2
    Administrator Cebby's Avatar
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    Re: Compressor Screw Valve (drain) to a ball valve?

    Do you mean this?

    http://www.hammerzone.com/archives/w...ball_valve.htm

    If you do this mod, post pics! (I'd happily do a writeup for us to include in our articles here!)

  3. #3

    Talking Re: Compressor Screw Valve (drain) to a ball valve?

    Upon further investigation, the drain (coupling) has a bushing in it (assuming 1/4" NPT) for the screw valve, so I'm just going to get that out tonight and go get me a 90 degree elbow, some nipples and a ball valve and fix this thing like it should come in the first place.

    I'll take some "pimp" pics tonight.

    And I'll add the same thing to my OBA on my trail rig.

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  4. #4
    Administrator Cebby's Avatar
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    Re: Compressor Screw Valve (drain) to a ball valve?

    You said nipples.

  5. #5

    Re: Compressor Screw Valve (drain) to a ball valve?

    Go to a decent truck stop or HD truck repair place. They will have a brass spring valve and lanyard combo ($5-10) that allows you to easily drain the tank. Works like a charm.

  6. #6
    Administrator Cebby's Avatar
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    Re: Compressor Screw Valve (drain) to a ball valve?

    Quote Originally Posted by TomH
    Go to a decent truck stop or HD truck repair place. They will have a brass spring valve and lanyard combo ($5-10) that allows you to easily drain the tank. Works like a charm.
    Welcome Tom!

    I haven't seen this sort of thing before - there's a great truck stop for me on the way to DC (where I go every couple of months) called "The Gateway". They'll probably have it. Do I just ask for a brass spring valve?

  7. #7

    Talking Re: Compressor Screw Valve (drain) to a ball valve?

    or just do this...$5 at a local biz (not the big places like Lowe's or HD)

    Craftsman vertical 33 gallon model16732
    bottom side


    crappy screw valve out


    1/4 npt 90 elbow male to male
    ball valve


    easy access - bingo!


    use thread sealer - tape sux imo

    soap tested at 40 psi

    a zillion times easier to drain than the oem screw valve - poor design imo

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  8. #8
    Administrator Cebby's Avatar
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    Re: Compressor Screw Valve (drain) to a ball valve?

    Nice work Brian! Thanks for the pics!!

  9. #9

    Re: Compressor Screw Valve (drain) to a ball valve?

    Thanks. Sorry one is blurry. I used the same setup on my OBA tank on my 85, except I used a NIPPLE!

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  10. #10

    Re: Compressor Screw Valve (drain) to a ball valve?

    Quote Originally Posted by Cebby
    Welcome Tom!

    I haven't seen this sort of thing before - there's a great truck stop for me on the way to DC (where I go every couple of months) called "The Gateway". They'll probably have it. Do I just ask for a brass spring valve?

    Here is a link to Parker-Hannifin's version: http://www.parker.com/EAD/displayCat...NYARD%20VALVES

    If you ask for an "Air tank drain valve with a lanyard (cord)" they'll know what you're looking for. You can also find this stuff at any HD (KW, Freightliner, Peterbilt, etc.) dealer's parts counter.

    Good hunting

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