My posts not going through or what?? Because there seems to be a whole lot of repetition of info happening here.
From: Peter Fell Sent: Friday, February 26, 2016 3:12 PM To: cnc-list@cnc-list.com Subject: Re: Stus-List replacing cockpit drain thru hulls 30 MK1 We just had a discussion here on the listserv early February on exactly the same question for exactly the same boat. So I’d suggest searching your inbox (or archives) for that thread. But I’ll reiterate my experience when I did this a couple years ago on my 27 ... I didn’t find any flush mount thru-hull that had the same size flange and my existing ones were not in a condition that I wanted to reuse them. So, yes, I epoxy-filled the ‘cups’ left behind by the old flush-mounts and installed Groco mushroom-style thru-hulls and matching ball valves. I used marine plywood for the backing plates, shaped to fit the curvature of the hull and epoxy-coated. Bedded in Sikaflex 291 (think that was the one). At the time I did not go the route of using the matching Groco flange adapter bases with either studs (requires a fiberglass backing plate) or through-bolt (can use wood backing plate) but the Groco thru-hulls are tapered threads so that you get a decent amount of thread engagement with the valve. I don’t think thru-hulls from most other manufacturers are tapered so you might be running with only 2 or 3 threads of engagement. Same potentially for the original C&C thru-hulls. I may actually go back and retro-fit with the flange adapters for the cockpit drains and engine intake since they are in the area of the boat most prone to potential damage, that the much more robust flange adapter would protect against. Good resource is the pbase articles from compass marine. Another thing I didn’t do .... install a stainless Zerk Grease Gun Fitting (1/8-27 thread) on each valve (there’s a drain hole on the Grocos). This let’s you grease the ball valves without pulling the boat. Groco recommends using Dow Corning MolyCote 111 (silicone based) – that’s what they use in the factory. Peter Fell Sidney, BC Cygnet C&C 27 MkIII From: Joel Aronson via CnC-List Sent: Friday, February 26, 2016 9:59 AM To: cnc-list@cnc-list.com Cc: Joel Aronson Subject: Re: Stus-List replacing cockpit drain thru hulls 30 MK1 Try here: http://www.buckalgonquin.com/pdf/catalog.pdf The company is near us. Joel On Fri, Feb 26, 2016 at 12:52 PM, Joe at Zialater via CnC-List <cnc-list@cnc-list.com> wrote: I am trying to find the mfg. for the cockpit drain brass thru hulls on my 1975 30 MK1. They are flush to the bottom of the hull and have a flange diameter of 3.5 inches and a 1.25 inch hole. I have tried Groco and Perko but neither has the correct size although they both have brass flush mount versions. Does anyone have a suggestion on where I might find the original replacement. I would hate to have to modify the hole or use epoxy to make a non-original thru hull fit. Thanks for any ideas on this..... Joe Zia - 1975 C&C 30 MK1 Annapolis _______________________________________________ Email address: CnC-List@cnc-list.com To change your list preferences, including unsubscribing -- go to the bottom of page at: http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com -- Joel 301 541 8551 -------------------------------------------------------------------------------- _______________________________________________ Email address: CnC-List@cnc-list.com To change your list preferences, including unsubscribing -- go to the bottom of page at: http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com
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