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Submersible Pressure Gauges (SPGs)

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Many experienced divers feel instrument consoles make frequent monitoring of depth/time/deco status too inconvenient and add unnecessary bulk. They prefer to use a standalone SPG and wrist mount most of their other instruments. To help you manage your gas, we offer several sizes of SPGs in both 'naked' (i.e. without the boot) and console mounted versions.

> Submersible Pressure Gauge (SPG), Naked
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> Submersible Pressure Gauge (SPG), Naked

Side View of SPGs Many experienced divers prefer their SPG's to have an uncluttered face with easy to read graduations and without a boot. Coloring behind the graduations, typical of most designs, can make it more difficult to read, especially in the 0-500 psi range. However, the clean design of our naked gauges is very easy to read across the entire range. These rugged quality SPGs are calibrated to 5000-psi in 100-psi increments (Imperial) or to 300-Bar (400-Bar on the 1.5-inch) in 10-bar increments (Metric). They are configured as just the bare gauge in three different face and case sizes, with no boot and no hose. They feature a chrome-plated all brass housing and a copper beryllium coiled Bourdon tube mechanism, with rack and pinion movement (aka 'pinned') providing the greatest degree of accuracy and reliability. The luminescent dial glows-in-the-dark, making it easier to read in low light situations. All these pressure gauges are suitable for oxygen service and include an over pressure relief plug.

Spool Available in three sizes: 2.5-inch diameter with 2-inch face, 2.0-inch diameter with 1.75-inch face, and 1.75-inch diameter with 1.5-inch face. The two larger SPGs feature a tempered mineral glass face and the thin SPG has a scratch and impact resistant polycarbonate face. Just add the HP hose (see below) in your choice of length, along with a spool, to make the custom SPG configurations preferred by experienced divers. Our Naked SPGs include the Spool, with two oxygen compatible o-rings, to mate the hose swivel to the gauge. Note these popular gauges are sold under a variety of brand names, such as Dive Rite, HOG and Highland, and will be branded on the face of the gauge as such, but are all manufactured by Termo Industria in Italy.

Please be aware that if you shake the compact naked 1.5-inch face gauge, you will hear the sound of the internal spring contacting the body because it will not be muffled by the boot. The click sound is perfectly normal for all the 1.5-inch face gauges regardless of brand, and in no way affects the performance of the gauge. The larger naked gauges, because they have a larger body, do not make this sound.

> Blackface SPG, Naked
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> Blackface SPG, Naked

The blackface version of our naked SPG, also manufactured by Termo, are now available in all three sizes: 2.5-inch diameter with 2-inch face, 2.0-inch diameter with 1.75-inch face, and 1.75-inch diameter with 1.5-inch face and your choice of PSI or BAR. Designed for easy reading in low light and no light conditions, the needle and large bold markings are luminescent glow-in-the-dark white. The SPG's are otherwise identical to our white face SPGs with an all brass housing and a copper beryllium coiled Bourdon tube mechanism incorporating a rack and pinion movement. Also includes the Spool, with two oxygen compatible o-rings.



Tek Tip Tek Tip Symbol

What about "black face" instruments?

Blackface Aircraft AltimeterSPGs for diving are available with an aviation style face similar to the altimeter pictured at right. This type of face was adopted when aircraft began flying night missions and the instrumentation needed to be illuminated. A large expanse of white on the instrument panel reflected too much light, impacting night vision and flight safety. Thus the instrument face colors were reversed, in order to reduce reflected light and to protect the night vision of the pilot. Modern aircraft instruments also incorporate their own lighting, to eliminate the glare of external lighting reflecting from their covers.

When done properly, any type of luminescent dial SPG, white or black face, can be read in all light conditions, even low or no light conditions. To read your SPG in low or no light conditions, don't try to read the indications while shining your light at the face. Instead, hold your dive light directly against the SPG face for a moment, then move the light away. Now you can look at the gauge to easily read the SPG using only the back-light luminescence of the face, absent any reflected light or glare and without affecting your night vision.


> Mini-SPG, 1-Inch Face
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> Mini-SPG, 1-Inch Face

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 is Nitrox Ready, including a Viton o-ring and is rated up to 5000 psi, in numbered 1000 psi increments, with an easy-to-read scale and polycarbonate face.

The 1-inch 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 to the nearest 1000 psi of "full," "partial," or "empty." Several adapters which are available in the "Adapters & Special Fittings" section allow the mini-SPG to be attached to a High Pressure Hose if desired.

> DR Compact Submersible Pressure Gauge w/Boot & Hose
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> DR Compact Submersible Pressure Gauge w/Boot & Hose

The Dive Rite Compact SPG is graduated in your choice of PSI (100-psi increments) or BAR (10-Bar increments), and is Nitrox Ready. The luminescent dial glows-in-the-dark, making it easier to read in low light situations. The SPG is fully assembled with a removable boot, HP hose and spool. The compact SPG has a 1.5-inch scratch and impact resistant polycarbonate face. It features a chrome-plated brass housing with a Bourdon tube mechanism, which provides the greatest degree of accuracy and reliability. The SPG is available with either a 32-inch hose for use as a primary SPG or a 6-inch hose for use with stage and deco bottles.


> Computer and Analog Consoles
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> Computer and Analog Consoles

The Dive Rite Computer Console includes the popular Dive Rite NiTek Trio dive computer fitted together in a streamlined housing with the Dive Rite compact SPG. The Dive Rite Analog Console includes an accurate, oil-filled depth gauge, with a max-depth indicator, mounted in a low-profile boot together with Dive Rite's compact SPG. Both the Computer and the Analog Consoles are available in imperial (psi and feet) and metric (bar and meters) versions. A separate hose mount compass is also available.


Tek Tip Tek Tip Symbol

Choosing the Best Primary SPG Hose Length

For most recreational divers, the common high-pressure hose length of 32 inches is long enough to be run under the left arm, across the chest and clipped off on the right shoulder D-ring. A few divers with a large chest, or who like to hold their instruments well out from their body when reading, require a longer hose length of 42 inches. Recently, some recreational divers seeking very streamlined configurations are routing their HP hose with a compact SPG over their left shoulder in the same manner they route their BC hose and those divers are using HP hose lengths as short as 24 inches and even 21 inches.

Technical divers almost always carry a standalone SPG clipped off to the left waist D-ring. For use with double cylinder configurations, the typical HP hose length is 24 inches, although some divers find that length slightly too short. It's almost always too short when used with a single cylinder configuration. Many divers clipping to their waist D-ring find a HP hose length of 26 inches to work well with both singles and doubles. Cave and wreck divers also remove the SPG boot for the same reason they remove the cylinder boot, because the boot surfaces have been known to ratchet divers into tight spots, making extraction difficult.


> High Pressure Rubber Hoses
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> High Pressure Rubber Hoses

SALE - Bounce the rubber! - Upgrade to Double Braided Kevlar hoses for the same price as these rubber hoses!

Our high pressure hose is reinforced using double braided Kevlar, with a maximum working pressure of 5000 psi and a minimum burst pressure of 20,000 psi. The typical HP hose is a 7/16-inch male at the end that screws into the first stage HP port and a 7/16-inch female at the end that screws on to the SPG. The fittings are made from quality chrome-plated brass. Length is measured in inches, from end to end of hose, including the fittings and their threads.

Spool Note that all high pressure hoses use an 'air spool' with two tiny o-rings to mate the swivel connector on the hose to the fitting on the gauge. The air spool is not included with the hose (see the price list below to order) but we recommend replacing the air spool when replacing the hose. The standard spool has the flange in the center as pictured at right but a few SPGs, typically the plastic body ones, may only accept a spool without a shoulder in which case you will have to reuse the air spool from the SPG.


> High Pressure Double Braided Kevlar Hoses
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> High Pressure Double Braided Kevlar Hoses

SALE - Upgrade to Double Braided Kevlar for same price as rubber!

These high pressure double braided hoses have an outer polyester braided cover that is laid over a woven Kevlar layer. (Although the Kevlar makes them not as flexible as our low pressure double braided hoses, they are still more flexible than ordinary rubber HP hoses.) This hose has a typical outside diameter that works better with hose boots and consoles. Every hose is tested to 5000 psi and has a rated burst strength of 22000 PSI. Their fittings are made from quality chrome-plated brass. The typical HP hose is a 7/16-inch male at the end that screws into the first stage HP port, and a 7/16-inch female at the end that screws on to the SPG. Length is measured in inches, from end to end of hose, including the fittings and their threads.

Spool Note that all high pressure hoses use an 'air spool' with two tiny o-rings to mate the swivel connector on the hose to the fitting on the gauge. The air spool is not included with the hose (see the price list below to order) but we recommend replacing the air spool when replacing the hose. The standard spool has the flange in the center as pictured at right but a few SPGs, typically the plastic body ones, may only accept a spool without a shoulder in which case you will have to reuse the air spool from the SPG.


These Products Are Nitrox-Ready

Dive Gear Express offers diving products labeled Nitrox Ready, whose oxygen-compatible components are free of hydrocarbons and other contaminants. With Dive Gear Express, you don't have to make expensive aftermarket alterations to use oxygen-rich gas mixtures.

Click Here to read What Does Nitrox-Ready Mean?

Related Products

Pricing for Submersible Pressure Gauges

Image Item SKU Description Ship Status US $ Price
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  Computer and Analog Consoles  
Analog Console: SPG (psi) / Max Depth Gauge (fsw) & 32-Inch Hose  DR-RG2742 Analog Console: SPG (psi) / Max Depth Gauge (fsw) & 32-Inch Hose In Stock  $187.00
Computer Console: SPG (psi) / NiTek Trio & 32-Inch Hose  DR-CO8185 Computer Console: SPG (psi) / NiTek Trio & 32-Inch Hose In Stock  $499.00
Analog Console: SPG (bar) / Max Depth Gauge (msw) & 32-Inch Hose  DR-RG2742-BAR Analog Console: SPG (bar) / Max Depth Gauge (msw) & 32-Inch Hose In Stock  $187.00
Computer Console: SPG (bar) / NiTek Trio & 32-Inch Hose  DR-CO8185-BAR Computer Console: SPG (bar) / NiTek Trio & 32-Inch Hose In Stock  $499.00
 DR-CO8005 Console Boot for Duo/Trio and SPG (Boot Only) In Stock  $34.00
  Gauges with Hoses  
DR SPG, 1.5-inch face in PSI, w/boot and 32-Inch Hose  DR-RG2740 DR SPG, 1.5-inch face in PSI, w/boot and 32-Inch Hose In Stock  $102.00
DR SPG, 1.5-inch face in BAR, w/boot and 32-Inch Hose  DR-RG2740-BAR DR SPG, 1.5-inch face in BAR, w/boot and 32-Inch Hose In Stock  $102.00
DR SPG, 1.5-inch face in PSI, w/boot and 6-Inch Hose  DR-RG2740-6 DR SPG, 1.5-inch face in PSI, w/boot and 6-Inch Hose In Stock  $102.00
DR SPG, 1.5-inch face in BAR, w/boot and 6-Inch Hose  DR-RG2740-BAR-6 DR SPG, 1.5-inch face in BAR, w/boot and 6-Inch Hose In Stock  $102.00
  Gauges only  
Naked SPG, 2.0-inch White face (2.5-inch dia) in PSI  FXPG25 Naked SPG, 2.0-inch White face (2.5-inch dia) in PSI In Stock  $64.95
Naked SPG, 2.0-inch White face (2.5-inch dia) in BAR  FXPG25M Naked SPG, 2.0-inch White face (2.5-inch dia) in BAR In Stock  $64.95
Naked SPG, 1.75-inch White face (2-inch dia) in PSI  FXPG20 Naked SPG, 1.75-inch White face (2-inch dia) in PSI In Stock  $64.95
Naked SPG, 1.75-inch White face (2-inch dia) in BAR  FXPG20M Naked SPG, 1.75-inch White face (2-inch dia) in BAR In Stock  $64.95
Naked SPG, Thin 1.5-inch White face in PSI  FXPG15 Naked SPG, Thin 1.5-inch White face in PSI In Stock  $54.95
Naked SPG, Thin 1.5-inch White face in BAR  FXPG15M Naked SPG, Thin 1.5-inch White face in BAR In Stock  $54.95
Naked SPG, 2.0-inch Black face (2.5-inch dia) in PSI  FXPGB25 Naked SPG, 2.0-inch Black face (2.5-inch dia) in PSI In Stock  $69.99
Naked SPG, 2.0-inch Black face (2.5-inch dia) in BAR  FXPGB25M Naked SPG, 2.0-inch Black face (2.5-inch dia) in BAR In Stock  $69.99
Naked SPG, 1.75-inch Black face (2-inch dia) in PSI  FXPGB20 Naked SPG, 1.75-inch Black face (2-inch dia) in PSI In Stock  $69.99
Naked SPG, 1.75-inch Black face (2-inch dia) in BAR  FXPGB20M Naked SPG, 1.75-inch Black face (2-inch dia) in BAR In Stock  $69.99
Naked SPG, Thin 1.5-inch Black face in PSI  FXPGB15 Naked SPG, Thin 1.5-inch Black face in PSI In Stock  $59.99
Naked SPG, Thin 1.5-inch Black face in BAR  FXPGB15M Naked SPG, Thin 1.5-inch Black face in BAR In Stock  $59.99
Mini-SPG, 1-Inch Face in PSI  FXPG1 Mini-SPG, 1-Inch Face in PSI In Stock  $17.85
Mini-SPG, 1-Inch Face in BAR  FXPG1M Mini-SPG, 1-Inch Face in BAR In Stock  $17.85
  SPG Components  
Air Spool w/ O-rings for SPG Swivel  DR-RG27AS Air Spool w/ O-rings for SPG Swivel In Stock  $3.15
Genuine Viton 003 O-ring, brown, 75 duro, package of five (SPG spool)  FX-V568A -003 Genuine Viton 003 O-ring, brown, 75 duro, package of five (SPG spool) In Stock  $3.00
All Dive Gear Express financial transactions are in United States Dollars (US $).
Prices in currencies other than US $ are approximations and should be used as a guide only.

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