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I've had one for over 20 years and used it maybe a 1/2 dozen times with limited success. It's a lot of money for a tool that's marginally useful at best but you got a great price on it. I am a big fan of Jet Swett set. At 1/4 the price of Pro-Press and 1/2 the price of a freezer, it is a set of tools that gets used much more often with good and predictable results. I consider a Jet Swett kit to be an essential for any plumbing truck.
i have large freeze bags, ridgid electric super freezers and now these freeze collars.
my go to freeze set up is the electric ridgid superfreeze as it's plug and play. as long as you have power, you have freezing. as long as the line is not in use/ flowing.
i've never failed to freeze a pipe and i've never taken on every job i was asked to freeze.
the whole thing about freezing pipe is knowing what is feasible and what's not to freeze. the last 2 i was called upon, i looked at 1 and discussed other options and the other i spoke in detail to the plumber and told him it will not work under those conditions.
liquid co2 is -110f. it's cheap and easy to handle.
while liquid nitrogen is -346 to - 321f. but much more dangerous to work with and handle and transport. plus much more costly.
remember that water in motion will seldom freeze. especially when you're only trying to freeze an inch or two of the total system.
Save your money on the kit. buy just the gaskets. Add some all thread, tubing, washers and a nut and you got the same thing.
you can use properly sized neoprene tubing such as 1/4 and 5/16 fuel line, 1/4 all-thread, and some nuts and washers as Ben said. I made one once when we didn't have time to go out and buy a jet-sweat. It was a barracks refub at Little Creek Ben about 15 years ago.
"When we build let us think we build forever. Let it not be for present delight nor for present use alone. Let it be such work that our descendants will thank us for, and let us think, as we lay stone upon stone, that a time is to come when these stones will be held sacred because our hands have touched them, and that men will say, as they look upon the labor and wrought substance of them, "See! This our fathers did for us."
John Ruskin (1819 - 1900)