SCBA parts?

Here is the video I saw that made me realise I could build the assembly. He uses some different parts but you can get a good idea of what to do

http://youtu.be/2HUPctVzebk

I got the parts from different places. Here is a parts list

Block with bleeder from Airhog
http://www.airhog.com/index.php?id_product=43&controller=product

CGA347 SCBA adapter from Ebay
http://tinyurl.com/jtypjsz

Hi pressure hose from Ebay
http://tinyurl.com/hlr2btw

5000 psi gauge from Norther tool
http://www.northerntool.com/shop/tools/product_48484_48484

You can get the 1/4" to 1/8" adapter from any hydraulic store 
 
Northshorecompressor.com 
They'll have everything you need under the paintball section. 
Although, the lines they sell are 1/4" so, you'll lose more air during bleeding than if you were to get micro bore hose. 
CGA 347 is the SCBA fitting. 
Shoot me a PM if you end up going with their high pressure lines. I upgraded to micro bore and would be happy to help you try to keep your cost down. 
Tom