http://larashots.com/appleyard/3d/aa_brmask_hemisphere_on.zip

  Made by Anthony Appleyard. Also in the freestuff. Please report any faullts to me.
  It is set up with my workman model (the version with closed cuffs) wearing it. He should be downloaded separately, if you have not already installed him in your Poser.

  Hereinunder, for c:Poser' read whatever folder your Poser is in.  Folder' means `directory', for those who remember times before Windows 95.

The models (which will appear in the character folders DiversBreathingmasks) are:-

brmask_hemisphere.cr2 , the mask alone
brmask_hemisphere_industaql.cr2 , man in boilersuit with aqualung-type industrial breathing set with the mask
brmask_hemisphere_industrebr.cr2 , man in boilersuit with backpack rebreather breathing set in casing with the mask

The mask's part "mask" has alternate geometry to choose between 3 shapes (2 round windows, 2 joined round windows, big curved window).
The mask's part "hemisphere" has alternate geometry to choose between 3 shapes (2 hose connections, one hose connection, hose connection and blowoff valve); and has Translate parameter dials, so it can be unclipped from the mask and let dangle on its user's chest.
The rebreather's part "backpack" has alternate geometry to choose between 3 shapes.