<div dir="ltr"><div>Hi Mark,</div><div> </div><div>Just one thing to add along with the other posts.</div><div> </div><div>Think about the paint thickness. This can really mess up the size of the groove. When I fitted my hatch O ring I messed about with various different thicknesses of cord to try and compensate for the paint. In the end, I had the hatch seat re-blasted and painted it again with a much thinner coat. I still had to use a custom O ring. In fact, I had lots of O ring issues with all my seals until I could get the right ones for the job. I used this place in the UK for all the seals and they made me loads of custom rings and cords. For example, the normal through hulls should have a 16 x 2.5 O ring. Couldn't get the bar through. 16 x 2 felt like it wouldn't seal. 16 x 2.35 went through fine and seals. No leaks at all.</div><div> </div><div><a href="http://www.polymax.co.uk/">http://www.polymax.co.uk/</a></div><div> </div><div>Regards</div><div>James</div></div><div class="gmail_extra"><br><div class="gmail_quote">On 20 October 2014 01:03, via Personal_Submersibles <span dir="ltr"><<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hello Psubs group,<br>
<br>
I would like to ask the group where I can purchase an O-Ring for a 24" conning tower hatch ring. I also need to mill the slot in the hatch ring and would like to know the width and depth of the slot. I've heard some folks recommend a dove tail slot for the O-ring.<br>
<br>
Many thanks for your advise.<br>
<br>
Mark...<br>
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