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Frank, I knew it would be simple! I'll shop around. The PVC solution sounds the easiest and cheapest to find. I want to use components available to anyone anywhere as I'm sure if this idea pans out more people will want to make them. I could do this but the cost of shipping them would be prohibitive. Thanks again Frank! David Bartsch From: ShellyDalg@aol.com Date: Sun, 8 Aug 2010 18:52:09 -0400 Subject: Re: [PSUBS-MAILIST] chiller problem To: personal_submersibles@psubs.org Hi David. A "bulkhead" fitting is easy to get. It is just a threaded nipple with a couple rubber washers and a "nut" that tightens down with the barrier in between. The simplest ones are PVC or nylon and good for your project. The higher pressure applications use brass, and top-of-the-line uses stainless.
To picture it......imagine the flapper valve on your toilet tank. That is a "bulkhead" fitting where the whole assembly penetrates the water tank.
Most large hardware stores will have some type of these. I've seen them with "barb" fitting ends so a simple hose and clamp can be attached.
They generally run about 2 or 3 dollars in a 3/4 inch size. They're not much good at high pressure applications like a pressure vessel, but with a container filled with liquid at room pressure, and any higher pressure is restricted to inside the fitting, they work fine.
Frank D.
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