push to connect fitting

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by lwlevens, Nov 20, 2018.

  1. lwlevens

    lwlevens Medium Load Member

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    Found a small leak when installing my air dryer IMG_20181120_202722.jpg on this fitting I believe its 1/4" tube x 3/8" threads it was barley leaking so I gave it a fresh straight cut anyway and now it leaks a lot worse should of left it alone. O ring was cracked and dry rotted,so replaced the o ring but theses o rings are a little different then normal o rings reinstalled
    fitting and still leaks.Where can I buy this and other connect fittings? No parts stores around here sells these kind of fittings... Frustrating. Thanks guys.
     
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  3. SteerTire

    SteerTire Road Train Member

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    Try a welding supply, or plumbing supplier. Not joking, those guys carry the strangest things. Especially when it comes to brass fittings.
     
  4. lwlevens

    lwlevens Medium Load Member

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    Thanks, was thinking of going to home depot but it needs to work with 120 psi.
     
  5. Goodysnap

    Goodysnap Road Train Member

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    You must use DOT brass on anything air brake. Every heavy truck parts house and truck dealer across the globe should have these on hand. Try Parker store or hydraulic parts suppliers for stock of proper hose and fittings. I would guess your fitting in question is 1/4 x 1/8"npt. A traditional compression fitting will fit in its place just the same.
     
  6. rabbiporkchop

    rabbiporkchop Road Train Member

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  7. lwlevens

    lwlevens Medium Load Member

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    Thanks 3/8 npt goes in the air compressor governor.

     
  8. stayinback

    stayinback Road Train Member

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    Not true- they have come out with composite fittings that are just as durable as the brass- (Elbows-unions-etc) Actually I was skeptical at first- But now,I replace any airline fitting with the comp ones
     
  9. Goodysnap

    Goodysnap Road Train Member

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    Every port on the governor is 1/8" NPT, not 3/8"
     
    spsauerland Thanks this.
  10. lwlevens

    lwlevens Medium Load Member

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    Really I measured the width of the threads with my calipers and it was 10 mm which I believe is 3/8 ?
     
  11. spsauerland

    spsauerland Road Train Member

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    PTC fittings all seem to leak! Hard to beat compression fittings. One in picture to a compression would a VS269NTA4-2.
     
    snowman_w900, Oxbow, SAR and 2 others Thank this.
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