Mini-SPG, { 1 in | 2.5 cm } Face

As low as $14.95
In Stock
This Mini-SPG is larger than most and easier to read.

The Mini-SPG should be installed as tightly as possible by hand and then just snugged slightly with a large adjustable wrench. Keep in mind it is the O-ring at the base of the threads that makes the seal on the high pressure gas. Excessive force using the wrench won't make a better seal but will warp the Mini-SPG body, break the O-ring face seal and cause a flood or the clear cover to fall out entirely.

Mini-SPG, { 1 in | 2.5 cm } Face

White and Black Mini-SPGs in PS and BAR
White and Black Mini-SPGs in PS and BAR Side View Glowing in the Dark
  • Screws directly into the standard HP 7/16-inch port of a regulator 1st stage
  • Rated up to {5000 psi | 350 bar} in numbered {1000 psi | 100 bar} increments
  • O2 compatible o-ring and suitable for use with pony, inflation and bailout bottles
  • Has a {1 in | 2.5 cm} diameter face and is available in white or black - PSI or BAR
  • Does not require a hose or air spool for use

This miniature submersible pressure gauge (aka Mini-SPG, pony gauge, button gauge) screws directly into the standard high pressure 7/16-inch port of the regulator first stage and does not require a hose or spool. Our version of the gauge includes an oxygen compatible o-ring and is rated up to { 5000 psi | 350 bar }, in numbered { 1000 psi | 100 bar } increments, with an easy-to-read scale and clear polycarbonate face cover. Now available in your choice of white or black face.

The { 1 in | 2.5 cm } face is larger than most and relatively easy to read, but any Mini-SPG indicator needle can be difficult to read underwater. Still, the Mini-SPG works well for some applications with the benefit of no hose clutter. The Mini-SPG is suitable for use with pony, inflation and bailout bottles where you just need an indication of "full," "partial," or "empty." The adapters shown above, which are available in the Adapters and Fittings section, allow the Mini-SPG to be attached to a High Pressure Hose if desired.

More Information
Weight 0.200000
Brand DGX

SPG Floods

A properly installed SPG with water inside is rare and may just mean the SPG was defective, particularly if it is new. If an SPG that has been working is still working when flooded then most likely something broke the seal on the face, usually an impact. Impact damage is an unavoidable fact, it's not serious, just replace the SPG. It's more of a concern to discover a non-working flooded SPG on a cylinder other than the primary. If the SPG is not working then the Bourdon tube might have ruptured, and that is often because water entered the tube through a flooded first stage. Diving with stage, deco and bailout cylinders turned off is a common practice to prevent gas loss, but the regulator must be charged with pressure before descending or it will flood. If the first stage floods, it should be serviced immediately.

Sometimes divers forget to charge, but in our experience the gas pressure was inadvertently drained before reaching depth. The second stage might inadvertently be purged while gearing up. Sometimes it purges from the force of entry and free flows until drained or just dribbles out during the descent, which was one of the original reasons for leaving the valve off. If practical, make a habit of charging the regulator again during descent. An alternative on emergency bottles is to leave the valve open, but place an inline slide cutoff between the hose and the second stage and put an OPV on the first stage.

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