Use the regulators the Pros trust. 

The HAYMKR is a precision adjustable competition regulator 400psi - 850psi. Powerhouse uses a stainless steel temperature resistant insert with their gen 3 piston, that gives the regulator rock solid consistent air flow.  A rotational locking cartridge combined with low profile burst disks allows the user to custom fit how the regulator gauge and fill nipple lines up on their marker, eliminating any wrist discomfort.

Additional Features:

• Dual Flat burst discs for added safety
• Fully serviceable internals
• 500psi Output Pressure - Factory Set
• Stainless Steel Cartridge
• Dual O-ring
• Woven Piston Spring
• Direct To Tank Fill Passage
• Weight - 5.3 oz
• 100% Made in the USA
• All Powerhouse regulators are hand assembled, and pressure tested for 24hrs