Salt water deck wash suction hole

 Morning team,


I am going to install a saltwater deck wash in on my fibreglass boat but being that I have only owned plate boats, should I stay clear of having my hole for my auction drilled through my transom or doesn't really matter if I seal it well with sikaflex/marine sealant ? 

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North Coast Marine's picture

Posts: 72

Date Joined: 23/05/16

Use a scoop/skin fitting

Wed, 2020-02-12 07:44

Use a scoop/skin fitting through the hull/bilge area





Jackfrost80's picture

Posts: 6585

Date Joined: 07/05/12

^ Jonny did mine and I'm glad

Wed, 2020-02-12 13:01

^ Jonny did mine and I'm glad I went down that line but we only just got it all in by a bee's dick


If catching wrasse is cool, consider me Miles Davis

pelagicyachts's picture

Posts: 1040

Date Joined: 23/02/11

do not use sika to seal into

Wed, 2020-02-12 07:55

do not use sika to seal into plywood (transom) it will let water in over time - the proper way to do it is drill oversize holes and then tap a thread in - bit of effort but will save your transom from rotting over time

carnarvonite's picture

Posts: 8081

Date Joined: 24/07/07


Wed, 2020-02-12 08:29

 Not much sense in putting it through the transom as when you are up and planing there will be nearly no water entering the hole. 

Better to fit a scoop

Posts: 8

Date Joined: 31/01/20

 Thanks guys 

Wed, 2020-02-12 10:02

 Thanks guys 

Posts: 8

Date Joined: 31/01/20

 So drill through the hull

Wed, 2020-02-12 10:05

 So drill through the hull and fit the scoop? Or can this piece be placed through the transom? What wpuld

you recommend to seal it when fitted 

Posts: 438

Date Joined: 09/11/06

fix it to your trim tab

Wed, 2020-02-12 11:24

I hade the same problem as to where to put a pick up . ended up bolting on a small tube to one of my trim tabs . hose attached to tube and over the transom . Been there for about 6 years and works fantastic

ranmar850's picture

Posts: 2611

Date Joined: 12/08/12

If you want to do it properly, don't use the transom

Wed, 2020-02-12 12:35

 You need a fitting down through the hull, not through the transom. Look over the back when you are planing--the transom is out of the water. As for the type that relies on water being forced up by a pickup tube bolted to  the the transom facing forward--these only work when you are travelling fast, and not very well at that.  A fitting through the hull, with a scoop facing forward, will work 100% of the time. And you are putting a hole through solid glass ( assuming you don't have a "cored": hull, not much of that rubbish in Australia) Just drill the hole slightly oversize and seal the cut edges with epoxy and let it set before fitting the through hull, with a ball valve on top, and sikaflex. Make sure it has a strainer/scoop facing forward, or it won't work very well at speed. And don't get the cheapest pump--the smaller ones are usually rated at 11 or 12 l/min. I can just about piss that fast. Get a 20l/min job, much, much better. 

scubafish's picture

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Date Joined: 15/08/12


Wed, 2020-02-12 16:11


Posts: 566

Date Joined: 19/06/14

Make sure it’s bronze below the waterline.

Wed, 2020-02-12 21:26

Go through your hull and use a bronze ( even better still brass )  fitting. Make sure you put a check valve on the fitting . If you want to be super anal, add a wooden cone dowel attached to your through hull with some 10lb line . You ever f@#k a fitting and have a hole in your boat at least you've got a get home free card. I've got em in my tub and it give me peace of mind.



 My wife understands why I clean my rods n reels in the shower....


Posts: 8

Date Joined: 31/01/20

 Thanks for all the advice

Thu, 2020-02-13 07:32

 Thanks for all the advice guys. I'll have a crack this weekend 

Posts: 475

Date Joined: 23/04/11

External for me

Mon, 2020-02-17 14:16

Posts: 8

Date Joined: 31/01/20

 Looks good 

Wed, 2020-02-19 10:09

 Looks good