Just to make sure no one mistakenly buys the wrong Soviet regulator, I want to point out that the Soviet/Russian two hose regulators you see currently on eBay are NOT 2 stage regs, and they are not AVM-1Ms. And they are not single stage regs, either!
They are the AVM-3, which is a SECOND STAGE, not single stage, reg that requires the use of a remote first stage. DO NOT connect the AVM-3 to a tank w/o a first stage in between! They are recognizable by the 2 port LP connection pipe that sticks down prominently. The two regs share the same or very similar bottom can, cloth covered hoses, and metal mouthpieces. Their similarity looks-wise might be the reason people are confused and think the AVM-1M is a single stage regulator.
The Sportsways doublehose non-return valve cages EDIT: ( are just slightly larger than the openings on your metal mp
. INCORRECT! I forgot what I had to do to fit them. They actually fit inside w/o shaving, but need a small cutout on one edge to fit around the MP tube.) If you can get ahold of some they are easy to modify and get inside! A perfect seal could be accomplished with an o-ring groove or two.
, on Flickr