Nitrox Ready and suitable for use with air or argon, the DGX Gears FIRST Regulator has a classic downstream (aka "flow-by") piston first stage and includes an over pressurization relief valve (OPV). Primarily intended for use in inflation and light SCUBA applications such as pony bottles and oxygen accelerated decompression, this first stage provides unusually good performance for such an inexpensive system. Measuring {4.0 in x 1.5 in | 10.2 cm x 3.8 cm}, the regulator offers three standard size low pressure 3/8-inch ports (one is used by the OPV), one standard size high pressure 7/16-inch port. This regulator has the typical BSP G5/8 DIN connector that will fit 200 Bar and 300 Bar valves.

Any competent service tech will have no issues with service of the DGX Gears regulator models. Our suggested service interval for all DGX Gears regulators is every two years or one hundred dives. There is nothing unique about DGX Gears regulators in terms of service requirements and needs no special equipment beyond that found on the typical regulator technician bench. We believe our customers also have the right-to-repair, so we publish detailed service manuals and we sell without restriction all service parts and periodic service kits for the DGX Gears brand regulators. See the Product Attachments tab of the periodic service kits for service manuals including IPB and torque values.

On dedicated inflation systems or on breathing systems where the second stage has a flow stop cut-off installed, there is no regulator second stage to provide relief should the high pressure seat begin to fail and the intermediate output pressure rise. Without a way to relieve the pressure, the device could begin inflating rapidly or the low pressure hose could rupture. Best practice in such configurations is to include the over-pressure relief valve to provide the same relief function as a normal regulator second stage. If you configure the FIRST with a normal second stage, then the OPV is unnecessary and may be removed if you wish.