You can get the fittings from rparts.com or local suppliers. They're prety cheap.
Also, you don't need a real vacuum pump. If you're patient, an old compressor will work as well. Though if you do that with propane, its best to vaccum it, charge it, vaccum and so on a few times. Annoying, but a good pump costs about 3x times as much as a simple phase change system, so its not worth it IMO unless you're doing a lot of systems.
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