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Old 07-13-2010, 03:49 PM   #1
Titan
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Default Tubing plugs

so I was at the hardware store today at lunch to buy the final pieces for my CPH and came across these, thought I should share this with the group

I'm not sure if this is the exact brand but it should give you an idea of what I'm talking about
http://www.mocap.com/tube-plugs-round-standard.html

I found one that fits perfectly onto a 3/8" aluminum rod and also fits snugly inside 1/2" PVC

all I have to do is trim the "Cap/button" portion off and glue it onto my pump rod, this should eliminate the issues I have been having with o-rings not sealing properly

I'll let you know how it works out
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Old 07-13-2010, 05:25 PM   #2
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Default Re: Tubing plugs

Those caps aren't meant to seal against pressure, so I don't know how well they'll work. But not much you can do besides try it and see.
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Old 07-13-2010, 09:00 PM   #3
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Default Re: Tubing plugs

They'll probably blow out, as cantab said, because they don't grip the pipe.

I would get real end caps, made from copper, and then do whatever you're supposed to do to connect those properly.
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Old 07-13-2010, 11:04 PM   #4
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Default Re: Tubing plugs

I usually use a tiny cut of a 3/8" wooden dowel to stuff into the end of a 1/2" aluminum rod, then cover it with epoxy/epoxy putty. It has worked every time so far.
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Old 07-14-2010, 12:21 PM   #5
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Default Re: Tubing plugs

Quote:
Originally Posted by zeda.beta
They'll probably blow out, as cantab said, because they don't grip the pipe.
It won't blow out, because it's going on the inside end of the pump rod - so the pressure would force it against the rod. The idea I think is that the ridges will seal against the inside of the pump cylinder, like a o-ring does.
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Old 07-14-2010, 01:46 PM   #6
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Default Re: Tubing plugs

Oh, didn't quite get where they were going to be used. They might work, but o-rings could offer a better seal when combined with that.
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Old 07-14-2010, 07:18 PM   #7
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Default Re: Tubing plugs

Titan, those pieces, look cool, but I'd be worried about sizing. Are you sure that the rim's diameter is larger than the diameter of whatever rod it screws into? Unlike an O-ring, there may not be too much leeway because there may be too much material for it to be able to compress.

Regardless, I agree that strength shouldn't be much of a problem. Some type of plug, secured by epoxy, should do the trick.

zeda.beta, initially I thought the pieces were meant to be used for nozzles, too. Unfortunately, there's not much to hold onto when screwing and unscrewing them, which could be problematic when they're wet.
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Old 07-16-2010, 10:09 AM   #8
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Default Re: Tubing plugs

I got to test this a bit last night

these plugs are made to be pressure fit into tubing so they are always slightly larger than the tubing they are made for, so the one I have is made for 1/2" metal tubing, I'm guessing somewhere in the 16ga wall thickness area, the "fins" are larger than 5/8" and fit quite snug inside 1/2" PVC

the plugs also do not "screw" in or out, each "fin" forms a complete circle around the center of the plug

the issue that might be a dealbreaker is that even tho it seals very well, I don't think there is any amount of lubricant in the world that this thing won't scrape off the walls of the pump tube, so it gets stuck and eventually pulls off the shaft

gorilla glue and other superglues may not be good enough, (I'm waiting for a full 24 hour cure to test again) I might have to go with a 2 part epoxy

if this doesn't work, the other end of the 3/8" rod I'm working with has my other solution, press fit nylon bushings with a 1/8" thick o-ring sandwiched between them

Last edited by Titan : 07-16-2010 at 10:17 AM.
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Old 07-16-2010, 01:44 PM   #9
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Default Re: Tubing plugs

Use 2 part epoxy, and then sand the edges of it to fit your pump with the best seal, but not too tightly.
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