Pump out adapter (1 3/4")

NomadicOneNomadicOne Member Posts: 10 ✭
edited June 2015 in General Boating Questions archive
Hi, I have seen someone post the same question but there was no actual reply in the chain. I want to try one of the screw in adapters for the pump out station instead of having to hold the hose in place and make sure there is a good seal. The fitting measures 1 3/4" and cannot find one online. Has anyone ever seen one for sale one in this size?
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Comments

  • WeberWeber Member Posts: 249 ✭✭✭
    I have seen the adapter but not sure if they were 1-3/4".
    Sin or Swim - Rinker 312
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  • NomadicOneNomadicOne Member Posts: 10 ✭
    West Marine and lots of online places have 1 1/4 or 1 1/2 for sale but I cannot find 1 3/4.
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  • StodgeStodge Member Posts: 2,738 ✭✭✭✭
    Mine is a 1 1/2.  Are you sure about the size?  I believe they go by the thread size.

    2002 FV 342 on Lake St. Clair - Past Commodore SHC - Vessel Examiner USCGAUX

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  • NomadicOneNomadicOne Member Posts: 10 ✭
    I'll post a picture of the cap shortly
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  • NomadicOneNomadicOne Member Posts: 10 ✭
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  • WeberWeber Member Posts: 249 ✭✭✭
    Ok, that is not how they classify the size.  That is the cap size.  They call the caps and deck plates by the hose size.

     
    Sin or Swim - Rinker 312
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  • WeberWeber Member Posts: 249 ✭✭✭
    For that deck plate you need the 1-1/2" adapter.
    Sin or Swim - Rinker 312
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  • WeberWeber Member Posts: 249 ✭✭✭

    Features of the Holding Tank Quick Connect Adapter

    • 100% Polypropylene constuction, non corrosive and chemical resistant
    • Fits all 1 1/2" PP Cam Lock Waste Lines
    • Fits all 1 1/2" NPT Deck mounted waste fittings (ensure your fitting is 1 1/2" NPT/IPS*, there are some 1/1/4", but usually on smaller vessles)
    • Molded in "eyelet" for attaching lanyards or "keeper" lines

    * Please note that 1 1/2" NPT or IPS fittings measure 1.9" (48mm) in diameter

    Sin or Swim - Rinker 312
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  • dalekdalek Member Posts: 260 ✭✭✭
    Contrary to logic, a pipe thread size is the thread that goes on the outside of a pipe with that bore. Therefore a 1" NPT or BSP Thread will be 1.315" Diameter, not 1" Diameter.
    1.1/4" Pipe thread diameter is 1.66"
    1.5" Pipe thread diameter is 1.9"
    11.5 Threads per inch for NPT (this thread is slightly tapered)
    11 Threads per inch for BSP (this may or may not be tapered).
    As Weber and Stodge say, it looks more like 1.1/2" than anything else.
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  • JC290JC290 Member Posts: 706 ✭✭✭
    That should be 1 1/2 fitting 
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  • NomadicOneNomadicOne Member Posts: 10 ✭
    Thanks guys, much appreciated!
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