New or used regulators

Some people will tell you that they have used the regulator and it worked fine for them. This is no assurance of a faulty or leaky regulator. If you can, 

Generally speaking a 0-100 psi gauge will meet a wide range of needs, unless you are refilling hydride bottles which will require higher pressures. 

A 0-500 range would be more suitable in that case. If you have a number of different applications where the outlet pressure used is quite different, you will want to purchase a regulator for each specific operation. 

Most regulators are equipped with a relief valve, one or two outlet ports and I an inlet port. The inlet port of a hydrogen cylinder regulator has to have a CGA 350 valve connector which consists of a bullet shaped nipple and a nut. The. outlet fitting on the regulator can vary and can be changed and/or adaptors 

1 used according to need. General-use line regulators can have a variety of outlet 

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