<html><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:12px"><div><span></span></div><div></div><div>On the R300, I use a standard sized O-ring with specified dash number with o-ring grove designed based on PArker free software to match the o-ring. I installed this on the lower hatch face. While this o-ring has provided a watertight seal, I find that sometimes the o-ring can become dislodged. Based on lessons learned, going forward, my new boat is designed with a 1/2 dove tail grove on the upper hatch exactly as Alan has described, i.e., external pressure force ring into flat side. Going to the 1/2 dove tail grove should keep the o-ring from popping out of the grove while not impacting its ability to seal . Putting in the o-ring in the upper hatch face will keep garbage out of the
grove.</div><div><br></div><div>While you can make up o-ring to any size by cutting and gluing, I know of one case in another boat in which this caused a small leak because they got the length wrong and were not precise enough on aligning the ends when adhesive. To me it is better to use the Parker software which is on online, and pick a standard dash number and design the grove to match this o-ring. O-rings are cheap and this tends to remove the two issues that caused this leak,</div><div><br></div><div>Cliff</div><div><br></div><div><br></div><div><br></div> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 12px;"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div dir="ltr"> <div class="hr" style="margin: 5px 0px; padding: 0px; border: 1px solid rgb(204, 204, 204); border-image: none; height:
0px; line-height: 0; font-size: 0px;" contenteditable="false" readonly="true"></div> <font face="Arial" size="2"> <b><span style="font-weight: bold;">From:</span></b> Alan James via Personal_Submersibles <personal_submersibles@psubs.org><br> <b><span style="font-weight: bold;">To:</span></b> Personal Submersibles General Discussion <personal_submersibles@psubs.org> <br> <b><span style="font-weight: bold;">Sent:</span></b> Sunday, October 19, 2014 10:38 PM<br> <b><span style="font-weight: bold;">Subject:</span></b> Re: [PSUBS-MAILIST] Conning tower hatch O-Ring<br> </font> </div> <div class="y_msg_container"><br><div id="yiv3642998980"><div><div style="color: rgb(0, 0, 0); font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px; background-color: rgb(255, 255, 255);"><div id="yiv3642998980"><div><div style='color: rgb(0, 0, 0); font-family: HelveticaNeue, "Helvetica Neue", Helvetica, Arial,
"Lucida Grande", sans-serif; font-size: 16px; background-color: rgb(255, 255, 255);'><div id="yiv3642998980yui_3_16_0_6_1413775608229_4"><span id="yiv3642998980yui_3_16_0_6_1413775608229_17">Hi Mark,</span></div><div id="yiv3642998980yui_3_16_0_6_1413775608229_4" style='color: rgb(0, 0, 0); font-family: HelveticaNeue, "Helvetica Neue", Helvetica, Arial, "Lucida Grande", sans-serif; font-size: 16px; font-style: normal; background-color: transparent;'><span id="yiv3642998980yui_3_16_0_6_1413775608229_19">I have heard of people with the square grove having trouble with the O-ring falling out, & having</span></div><div id="yiv3642998980yui_3_16_0_6_1413775608229_4" style='color: rgb(0, 0, 0); font-family: HelveticaNeue, "Helvetica Neue", Helvetica, Arial, "Lucida Grande", sans-serif; font-size: 16px; font-style: normal; background-color: transparent;'><span id="yiv3642998980yui_3_16_0_6_1413775608229_23">to stick them in with copious amounts of grease.
That could be a sizing issue though.</span></div><div class="yiv3642998980yui_3_16_0_1_1413775608229_5111" id="yiv3642998980yui_3_16_0_6_1413775608229_4" style='color: rgb(0, 0, 0); font-family: HelveticaNeue, "Helvetica Neue", Helvetica, Arial, "Lucida Grande", sans-serif; font-size: 16px; font-style: normal; background-color: transparent;'><span>I think it's a 1/2 dove tail grove they have on the K boats with the angled edge to the outside so that</span></div><div class="yiv3642998980yui_3_16_0_1_1413775608229_5111" id="yiv3642998980yui_3_16_0_6_1413775608229_4" style='color: rgb(0, 0, 0); font-family: HelveticaNeue, "Helvetica Neue", Helvetica, Arial, "Lucida Grande", sans-serif; font-size: 16px; font-style: normal; background-color: transparent;'><span>the O-ring is squashed by external pressure against the flat side of the grove.</span></div><div class="yiv3642998980yui_3_16_0_1_1413775608229_5111" id="yiv3642998980yui_3_16_0_6_1413775608229_4"
style='color: rgb(0, 0, 0); font-family: HelveticaNeue, "Helvetica Neue", Helvetica, Arial, "Lucida Grande", sans-serif; font-size: 16px; font-style: normal; background-color: transparent;'><span>(someone correct me if I'm wrong)</span></div><div class="yiv3642998980yui_3_16_0_1_1413775608229_5111" id="yiv3642998980yui_3_16_0_6_1413775608229_4" style='color: rgb(0, 0, 0); font-family: HelveticaNeue, "Helvetica Neue", Helvetica, Arial, "Lucida Grande", sans-serif; font-size: 16px; font-style: normal; background-color: transparent;'><span>I vaguely remember Phil saying the Deep Workers have the 1/2 dove tail grove.</span></div><div class="yiv3642998980yui_3_16_0_1_1413775608229_5111" id="yiv3642998980yui_3_16_0_6_1413775608229_4" style='color: rgb(0, 0, 0); font-family: HelveticaNeue, "Helvetica Neue", Helvetica, Arial, "Lucida Grande", sans-serif; font-size: 16px; font-style: normal; background-color: transparent;'><span>Alan</span></div><div
class="yiv3642998980yui_3_16_0_1_1413775608229_5111" id="yiv3642998980yui_3_16_0_6_1413775608229_4" style='color: rgb(0, 0, 0); font-family: HelveticaNeue, "Helvetica Neue", Helvetica, Arial, "Lucida Grande", sans-serif; font-size: 16px; font-style: normal; background-color: transparent;'><span><br clear="none"></span></div><div id="yiv3642998980yui_3_16_0_6_1413775608229_16"><br clear="none"></div> <div class="yiv3642998980qtdSeparateBR"><br clear="none"><br clear="none"></div><div class="yiv3642998980yqt7948293797" id="yiv3642998980yqt98358"><div class="yiv3642998980yqt8186062180" id="yiv3642998980yqt87523"><div class="yiv3642998980yui_3_16_0_6_1413775608229_8" id="yiv3642998980yui_3_16_0_6_1413775608229_9" style='font-family: HelveticaNeue, "Helvetica Neue", Helvetica, Arial, "Lucida Grande", sans-serif; font-size: 16px;'> <div class="yiv3642998980yui_3_16_0_1_1413775608229_2931" id="yiv3642998980yui_3_16_0_1_1413775608229_3047" style='font-family:
HelveticaNeue, "Helvetica Neue", Helvetica, Arial, "Lucida Grande", sans-serif; font-size: 16px;'> <div id="yiv3642998980yui_3_16_0_1_1413775608229_3049" dir="ltr"> <div class="hr" style="margin: 5px 0px; padding: 0px; border: 1px solid rgb(204, 204, 204); border-image: none; height: 0px; line-height: 0; font-size: 0px;" contenteditable="false" readonly="true"></div> <font id="yiv3642998980yui_3_16_0_1_1413775608229_3050" face="Arial" size="2"> <b><span style="font-weight: bold;">From:</span></b> via Personal_Submersibles <personal_submersibles@psubs.org><br clear="none"> <b><span style="font-weight: bold;">To:</span></b> personal_submersibles@psubs.org <br clear="none"> <b><span style="font-weight: bold;">Sent:</span></b> Monday, October 20, 2014 1:03 PM<br clear="none"> <b><span style="font-weight: bold;">Subject:</span></b> [PSUBS-MAILIST] Conning tower hatch O-Ring<br clear="none"> </font> </div> <div class="yiv3642998980y_msg_container"
id="yiv3642998980yui_3_16_0_1_1413775608229_3046"><br clear="none">Hello Psubs group,<br clear="none"><br clear="none">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 clear="none"><br clear="none">Many thanks for your advise.<br clear="none"><br clear="none">Mark...<br clear="none">_______________________________________________<br clear="none">Personal_Submersibles mailing list<br clear="none"><a id="yiv3642998980yui_3_16_0_1_1413775608229_3048" href="mailto:Personal_Submersibles@psubs.org" target="_blank" rel="nofollow" shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br clear="none"><a id="yiv3642998980yui_3_16_0_1_1413775608229_3045"
href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank" rel="nofollow" shape="rect">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br clear="none"><br clear="none"><br clear="none"></div> </div> </div></div></div> </div></div></div></div></div></div><br><div class="yqt7948293797" id="yqt99397">_______________________________________________<br clear="none">Personal_Submersibles mailing list<br clear="none"><a href="mailto:Personal_Submersibles@psubs.org" shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br clear="none"><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank" shape="rect">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br clear="none"></div><br><br></div> </div> </div> </div></body></html>