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Kayak or Boat plug — image 1
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Kayak or Boat plug

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This is for a .75" plug with the hole measuring just ship of 19mm.

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Model information

License
Creative Commons — Attribution — Noncommercial

This is a replacement boat plug that has an opening of about ¾"  or about 19mm.  It has a groove for grommet ¾" OD and 9/16" ID and 3/32" cross section.  

Since you print it handle down you will get a nice flat seat and may not need the grommet.

Two varieties.  My old plugs had a flat seat.  I made a flat version and one that has a groove that fits over the flange at the entry.  I don't know which is better.   I would say the groove version has more surface making contact.

On my original plugs they ether did not come with an o-ring or they would dry out in the sun (where I left them) and fall off.  It never seamed to make a difference in terms of seal.

Print instructions

Print knob down with a brim so it does not fall over. No supports should be needed.

I used PETG

 

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