Regulator Mouthpiece Orifice Sizes

Generally there are four common 2nd stage regulator mouthpiece sizes:

Standard size orifice regulator mouthpiece
- size 1-1/8 inch x 1/2 inch (28.6 mm x 12.7 mm)
Fits: Apollo; Aqua Lung older metal regulators, Conshelf 7 through 21 – snug; Atomic manufactured pre 2005 only and newer T3; Beuchat Evolution, Iceberg and Nitrox, VXT8, VXT Octo, VX4, VX8; Cressi-Sub Ellipse is a 2, XS Compact is snug; Dacor after 1992; IST except Proline is an intermediate; Ocean Master; Pro Sub Avalon; Scubapro S600, S360, S560, R095 and all models before the A700; SEAC; Sherwood most early models – Brut, Shadow, MagnumII, pre 1992 Blizzard + Oasis; Spare Air; Subgear R series and Cayman; Tabata/Tusa not TUSA Imprix.

Intermediate size orifice regulator mouthpiece
- size 1-3/16 inch x 5/8 inch (30.2 mm x 15.9 mm)
Fits: Aeris; Aqua Lung newer, including Titan, Legend, Kronos and Mikron; Atomic pre 2005 use a Standard, newer, larger orifice an Intermediate, if not sure, measure or try on; Beuchat VS3, VS4, VS8, VX10; Dacor Viper + Eagle; Dive Rite including O2ptima rebreather, but not the Jet Stream 4500; Edge HOG + EPIC; Forte; Genesis; Halcyon Rebreather + Regulators; Hollis except 500SE is a Large; Mares (not MARES MR-12-II, III, IV or V); Ocean Edge; Ocean Reef; Oceanic cannot fit Alpha 9 or Omega 3; Odyssey; Scuba Max; Scubapro models after 2010, including A700, C series, G260, R195 and S620TI; Sea Elite; Sherwood Maximus, 1992 and newer Blizzard + Oasis, SR1; SPORASUB; SUBGEAR SG50, SG30, SG10, Aruba and Bonaire, Tigullio, Tilos; XS SCUBA (previously IDI, Osprey is a standard).

Large size orifice regulator mouthpiece
- size 1-5/16 inch x 11/16 inch (33.3 mm x 17.5 mm)
Fits: Apeks; Dive Perfect; Hollis 500SE; and Zeagle 2nd stage regulators. Plus many rebreathers, including Golem Shrimp BOV; Hollis Prism+Explorer; ISC Megladon; Kiss Gem; Poseidon (snug fit); and Titan.

Extra Large size orifice regulator mouthpiece
- size 1-7/16 inch x 13/16 inch (36.5 mm x 20.6 mm)
Fits: Poseidon regulators.

Tech Tip: Inspect Your Regulator Mouthpiece

When is the last time you gave any thought to your regulator mouthpiece? Our service technicians tell us one of the most commonly damaged parts they discover during routine maintenance on a regulator second stage is the mouthpiece itself.

Many divers bite down much too hard on the mouthpiece, particularly if it is a poor fit. Besides the fact that biting too hard may cause the diver to climb out the water with an annoying headache, we even find bite tabs completely missing from the mouthpiece where they have been literally 'chewed off'. If that's happening to you, consider trying a different style of mouthpiece.

A more subtle damage often responsible for second stages 'breathing wet' is an almost invisible tear in the mouthpiece, just past the mounting lip on the second stage body near or under the cable tie. These often can't be seen unless you stretch the mouthpiece by hand and inspect in bright light.

Service & Repairs

Your experienced scuba gear service and repairs centre

Dive gear is incredibly dependable, but it is life support equipment, engineered to take you where humans aren't designed to go. Each piece of scuba gear has a specialised purposed and the aspects surrounding product education, fit, function and service may be as important to you personally as is the equipment itself. It's all part of the value equation, and why it is important to get your dive gear serviced regularly by an acknowledged expert scuba repair and service centre.

The Scuba Doctor offers full sport, recreational, technical and commercial dive equipment servicing and repairs. This includes servicing for ALL makes of regulators, cylinder testing, O2 Cleaning, shot blasting and dry suit repairs, to name just a few.

We have trained scuba technicians ensuring that there is someone qualified to provide assistance and advice on diving equipment maintenance matters.

Scuba equipment servicing can be done overnight if really necessary, however, we generally ask for more time to sort it out and do it right. The chances are that we will have it done quicker than almost anywhere else, but if you are on a tight schedule please let us know and we will do what we can for you.

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Expert Scuba Gear Servicing

As well as selling scuba gear from many of the world's best manufacturers of diving equipment, The Scuba Doctor can also Service and Repair every line of commercial, technical and recreational scuba diving equipment we carry. This includes:

AP Diving
Apollo
Dive Perfect
Miflex Hoses
Northern Diver
OMS - Ocean Management Systems
Sonar
Apeks Marine Equipment
Aqualung
Atomic
Cressi
Catalina Cylinders
Faber Cylinders
Mares
Suunto
Tusa

Our scuba servicing technicians have undertaken dive manufacturer's approved technicians courses for most of the major brands of scuba dive gear and diving equipment on the market. Plus, there is not much that we can't do with other brands with the years of scuba service and repair experience behind us, including:

Boss
Dive Rite
Divesoft
DUI - Diving Unlimited International
Edge & Hog
Halcyon
Luxfer Gas Cylinders
Oceanic
Performance Diver
Poseidon Diving Systems
Ralf Tech
Scubapro
SeaQuest
Sherwood
US Divers
Zeagle

You can rest assured that your dive equipment is in good hands.

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Competitive Prices

Our prices are fair and reflect the time spent servicing your scuba equipment. It is worth pointing out, that we do not cut corners when it comes to servicing. We only use manufacturers approved service kits and always replace every part recommended by the manufacturer. This may not make our scuba servicing charges the cheapest around, but at least it gives you the peace of mind that your life support equipment is being maintained correctly.