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Old 01 November 2015, 05:02   #1
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Country: UK - England
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Boat name: Dory
Make: Crompton Seasprint
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Transom Bungs

Hi all, I've had a couple of reliability issues over the last month.
The biggest problem is my old transom bung has been leaking.
After recovering the boat and removing the old bung fitting, it is clear that it was way under sized.
The hole is 30mm diameter and the bung fitting is much smaller so at least one of the screws was not locating into the transom and was just sitting in the copious amounts of sikaflex that was plastered in around it.
Even after a Internet search and speaking to two local chandlers I'm struggling to get a bung the correct size.

Does anyone know of a bung for a 30mm diameter hole (transom is 55mm thick).

Does anyone know what type of transom fittings cromptons were fitted with?

Thanks

Lee
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Old 01 November 2015, 05:39   #2
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Drain bungs for Ribs, inflatable boats and tenders

I personally now have the stainless self retaining one at 34 but got it for a tenner from boat jumble. Secure and less easy to forget
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Old 01 November 2015, 05:52   #3
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Bung

Quote:
Originally Posted by gtflash View Post
Drain bungs for Ribs, inflatable boats and tenders

I personally now have the stainless self retaining one at 34 but got it for a tenner from boat jumble. Secure and less easy to forget
Thanks gtflash, where did you get it from, do you have any pictures?

Thanks Lee
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Old 01 November 2015, 05:53   #4
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I think you have a few choices - but possibly none involve a 30mm bung hole if they aren't commericially available.

1. Fill the hole with suitable filler and re-drill at 25mm and use a "standard" bung.

2. Clean the wood on the transom up, seal with epoxy and tidy up the hole edges to give a nice smooth hole size then use something like this (35mm) to plug your new hole: 22mm / 40mm expanding Rib drain bung

3. Convert to elephant trunk with even bigger hole

4. Enlarge the hole and go for something a bit bigger like these: Zodiac Bombard Boat Drain Bung Plug Fitting Self Bailer Fitting Boating Sailing | eBay

55mm is a lot thicker than the average bung is, so you need to think about the other half of the hole. What I'd do is fill the hole with some fairly basic filler - poly filler would do. Just to get you a "solid" surface to work with. Then I'd pick the bung I wanted to use. Lets say you go with a 25mm one. I'd then dril out a hole maybe 35mm diameter (centre may be different to the old centre, but make sure you take out any cheap temporary filler. That should have sound dry transom on all is edges. Seal edges with neat epoxy. Fill the hole with epoxy + filler (baubles / fibres etc). Smooth perfectly flat and make look tidy. Drill that for 25mm. Fit 25mm on bed of sikkaflex. Bit without plug is now a waterproof tube.
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Old 02 November 2015, 02:49   #5
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Brass drain bung

The one above is 30mm

The one I got looks just like this from eBay. I got it from Tony Davis on boatmad as he fits them to extreme boats

BOAT TRANSOM BUNG MADE OF AISI 316 STAINLESS STEEL ,SCREW IN BUNG. FOR 32mm HOLE | eBay
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