Looking for a round access hatch *waterproof*

I already tried two different models:

this one is not watertight at all

https://www.ebay.co.uk/itm/WHITE-PLASTIC-ACCESS-ROUND-INSPECTION-HATCH-8-260MM-Boat-Motorhome-/162465582228

This one is waterproof. But you need to much force to turn it for pressing the lid against the seal.

Does anybody found a good one?

I have had great luck with these. They come in black or white in a few different sizes. They have a built in seal.

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Should be this one, right?

https://www.amazon.de/MagiDeal-Boot-Inspektionsdeckel-Inspektionsluke-Schraubdeckel/dp/B074NWK8DF/ref=sr_1_17?__mk_de_DE=ÅMÅŽÕÑ&keywords=inspektionsdeckel&qid=1556793089&s=gateway&sr=8-17

Is 8" enough to put 6S 20Ah Hobbyking Lipo through? What is the height of it?

I’m using those but they are 4 inch, very waterproof and easy to open/close if you grease the o-ring.
i’m just using the hatch to turn the board on and off, and remove the plate where they are mounted.

https://www.ebay.com/itm/New-Beckson-Deckplate-Inspection-Port-4-Screw-Out-Clear/254000433757?epid=658916024&hash=item3b239b0a5d:g:2vYAAOSw9ENZnd1p

there are 6 inch versions too:
https://www.ebay.com/itm/Beckson-Marine-Dp60-W-C-6-Clear-Center-Screw-Out-Deck-Plate-White/264300020509?_trkparms=aid%3D555018%26algo%3DPL.SIM%26ao%3D1%26asc%3D57475%26meid%3D7cbdb445fc8648e1abc69659b44a5e01%26pid%3D100005%26rk%3D2%26rkt%3D12%26sd%3D254000433757%26itm%3D264300020509&_trksid=p2047675.c100005.m1851

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I’ve noticed Beckson makes a lot of hatches including those on West Marine’s website. Seems like a legit product.

This is also a good hatch (confirmed by cristophe):

https://www.ruedelamer.com/grande-trappe-d-acces-355-x-600-midline-nuovarade.html

My board has a thickness of 10cm. The lipos have a height of 70mm. So it’s almost not possible to use a rectangular hatch because of its height.

Is it watertight? I used osculati and water entered easily in seconds…
I tried 3 different round hatches, all where watertight

Hi bender: could you share the links for those hatches?

I bought them at my local boat shop. I will try to find the brand

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Anybody tried a large screw on lid designed for a large bucket yet?

I’ve used this for my jet board. (obviously you need to cut the bottom part down)
Sizes from 110mm up to 315mm