<html><head></head><body><div style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;"><div><div>Jon,</div></div><div>I struggled with the question for Elementary 3000. Gamma has several hoes drilled and threaded in the hull with no reinforcement, just a drilled hole. Gamma has a 1\2 thick hull. Elementary 3000 also has a small hole drilled in the hatch and threaded. That is 1 inch thick, and tested to 2,900 feet fresh water with no issues. My non engineering opinion is it is fine.</div><div>Hank</div><div><br></div><div><br></div><div id="yahoo_quoted_3095121290" class="yahoo_quoted"><div style="font-family:'Helvetica Neue', Helvetica, Arial, sans-serif;font-size:13px;color:#26282a;"><div>On Friday, August 18, 2017, 9:29:56 AM MDT, Emile van Essen via Personal_Submersibles <personal_submersibles@psubs.org> wrote:</div><div><br></div><div><br></div><div><div dir='ltr'><html><body>Jon , Conversion mistake<br clear="none"><br clear="none">The hull should be 1/2"thick.<br clear="none"><br clear="none">Br, Emile<br clear="none"><br clear="none">-----Oorspronkelijk bericht-----<br clear="none">Van: Personal_Submersibles [mailto:<a shape="rect" ymailto="mailto:personal_submersibles-bounces@psubs.org" href="mailto:personal_submersibles-bounces@psubs.org">personal_submersibles-bounces@psubs.org</a>]<br clear="none">Namens Jon Wallace via Personal_Submersibles<br clear="none">Verzonden: vrijdag 18 augustus 2017 15:43<br clear="none">Aan: Personal Submersibles General Discussion<br clear="none">Onderwerp: [PSUBS-MAILIST] Tap instead of weld<br clear="none"><br clear="none"><br clear="none">On a thicker hull, installing a small penetrator (1/4 male NPT), is there<br clear="none">any structural reason why one could not just drill a tap such a fitting<br clear="none">instead of welding it?<br clear="none"><br clear="none"><br clear="none">Jon<br clear="none"><br clear="none">_______________________________________________<br clear="none">Personal_Submersibles mailing list<br clear="none"><a shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br clear="none"><a shape="rect" href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><div class="yqt1603761220" id="yqtfd03624"><br clear="none"><br clear="none">_______________________________________________<br clear="none">Personal_Submersibles mailing list<br clear="none"><a shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br clear="none"><a shape="rect" href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br clear="none"></div></body></html></div></div></div></div></div></body></html>