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  1. #1

    Installing a thru hull tip.. ?? need coupling

    WEll I read the instructions before cutting the hole. the riva instructions said that I needed a 3.25" coupling to attach the riva waterbox to the thru hull tip. Taking riva for their word that they know what they are doing, i went ahead and ordered two of them without measuring for each of the two rxps im working on.... well long story short its way too big.

    I measured it today and it looks like 2 5/8".. but this is an uncommon size, no? Can anyone confirm the size? I think im losing it...

    Anyone actually have the coupling fs to help me out? Jerry? I need it in a hurry....
    I tried to call Riva but they are closed.

    talk to me.


    Freakin BS that a $400 waterbox doesnt come with the coupling.


  2. #2
    speedskixp's Avatar
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    Quote Originally Posted by twelvesorbetter View Post
    WEll I read the instructions before cutting the hole. the riva instructions said that I needed a 3.25" coupling to attach the riva waterbox to the thru hull tip. Taking riva for their word that they know what they are doing, i went ahead and ordered two of them without measuring for each of the two rxps im working on.... well long story short its way too big.

    I measured it today and it looks like 2 5/8".. but this is an uncommon size, no? Can anyone confirm the size? I think im losing it...

    Anyone actually have the coupling fs to help me out? Jerry? I need it in a hurry....
    I tried to call Riva but they are closed.

    talk to me.


    Freakin BS that a $400 waterbox doesnt come with the coupling.
    I thought they were 2 1/2 inch couplers. Maybe riva was refering to the length.

  3. #3
    well riva screwed me. my guess is that they need to be between 2.5 and 2.75"

  4. #4

  5. #5
    Big K's son KeithKman's Avatar
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    Do you have the stock exhaust hose? Cut that for the time being and use it as the coupler.

  6. #6
    It doesnt appear to be big enough.

  7. #7
    speedskixp's Avatar
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    The stock exhaust hose should be big enough, you just need to cut it to length.

  8. #8
    I was just working on it some more. here is what I cant comprehend-

    the riva box diameter is slightly bigger than 2.5" its more like 2 5/8 unless I am crazy. Furthermore, there is a lip/hump around the pipe, making it even bigger. the only way i will get it to work is to lube it up, push like hell and hope for the best.
    THEN, how in the world will I fit it on the thru hull tip???
    This is a ball-breaking little job.


    BTW, cutting that hole was a little scary.. the hole-saw kicked like bitch.

  9. #9
    Big K's son KeithKman's Avatar
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    Quote Originally Posted by twelvesorbetter View Post
    I was just working on it some more. here is what I cant comprehend-

    the riva box diameter is slightly bigger than 2.5" its more like 2 5/8 unless I am crazy. Furthermore, there is a lip/hump around the pipe, making it even bigger. the only way i will get it to work is to lube it up, push like hell and hope for the best.
    THEN, how in the world will I fit it on the thru hull tip???
    This is a ball-breaking little job.


    BTW, cutting that hole was a little scary.. the hole-saw kicked like bitch.
    Put it on the end of the water box first and then push it onto the edhaust tip. Use glass cleaner as lube.

  10. #10
    I just dont see it happenin.. Ill give it a shot tmr.
    I was going to use dawn dish soap and try to wiggle it on

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