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First and second scuba regulator

What are the first stage and second stage scuba regulators?

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The scuba regulator has two parts: a 1st stage and a second stage connected by a hose. The 1st stage connects right to the tank; the 2nd stage is the contraption behind your mouthpiece. Both have an important function in regulating air flow throughout your scuba system.

Posted on Dec 01, 2008

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I need a service manual for my mk11 first stage


To rebuilt a first stage regulator requires special tools a quailfied service technician should rebuilt it put in a o-ring in the wrong spot can be fatal at deep depths you can call scuba pro direct and they can assist you in finding a repair facility close to you are they can repair it .

Oct 01, 2013 | Scubapro MK11 Din First Stage Scuba...

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I have been using my A700/mk25 for six month and recently it has been making a whislting noise when I inhale.


the whistle noise is some thing loose (torn o-ring) inside the second stage. this is covered under warranty. scuba pro offers a parts for life program which is no cost to you if 1st & 2nd stage with a computer are bought at one time. just pay service labor. the whistle noise will be repaired are replaced free under 1 year.

Dec 23, 2012 | Scubapro Mk25 & A700 High End Regulator By...

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Free flowing regulator


If free flow from the moment the unit is pressurized it could be the 1st stage intermediate pressure (IP) is too high or the second stage valve seat is missing, set screw is too loose, seat is damaged or has debris on it. If the free flow gradually increases under pressure it usually indicates a damaged 1st stage valve seat. A trained Mares Tech with the correct tools and genuine parts would be the best solution.

Aug 19, 2011 | Mares Rebel 12 Regulator

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The cover plate on the second stage of my sea-air tri metal is cracked. Where can I get a replacement?


Did you regulator come to you like this or is this a regulator that you have had for awhile and dropped or something and it broke if you received it like that it is covered by warranty since the sea air has a lifetime warranty. XS scuba does not have replacement parts readily available that I know of thats how they get you its the same as mares you just have to send them back to be serviced or to and authorized dealer. As long as you did not break it intentionally you should be fine. I have broke reg covers on 4 of my Mares regulators and had them all repaired no problems hope this helps and safe diving

Dec 29, 2010 | Xs Scuba Sea Air Tri Metal Regulator Great...

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I need to strip down my s555 regulator to find


Check here:
http://www.frogkick.dk/manuals/scubapro/Manuals/2.%20Stage/

May not have exactly your model, but something very very similar. Also, keep in mind, the second stage will free-flow as an "overpressure safety" if the first stage is malfunctioning. Check your intermediate pressure (should be ~150). If you can't do this, try your second stage on another first stage (any brand), and try another second stage on your first.

If it is for sure your second stage, check for proper adjustment of demand lever, bent/damaged demand lever or diaphragm plate, or damaged valve seat.

Jan 18, 2010 | Scubapro Service Diagrams Scuba Regulator...

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Possibly high intermediate pressure. slight second stage free flo


It is a HORRIBLE idea for you to dismantle your first stage. It should only be done by a trained technician because of how many small parts there are... now depending on your regulator you might have the ability to turn down the pressure... read the manual to find out if your reg has this adjustment capability. 

May 14, 2009 | Scubapro MK17/X650 Regulator SCUBA...

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How clean the first Stage on my scuba regulator


Simple green an a toothbrush should work fine. For stubborn spots, soak in vinegar for 4-5 hours, if still not clean, then a mixture of water and automotive chrome cleaner (mild abrastive) and a toothbrush. Rinse well. If still not clean, consult your local Scuba repair shop.

Mar 27, 2009 | ACCO Brands Apollo Bio-Filter Moisture...

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Guidelines to Scuba Regulator Purchase


The scuba regulator is employed in an open-circuit scuba set. Said scuba equipment reduces high air pressure conveyed by the diving cylinder to the first stage and feeds breathable gas to the diver through the second stage's mouthpiece. Also called pressure regulator or demand regulator, the scuba equipment is one of the essentials to diving that determines breathing quality and inhalation effort during the dive. But given the different types of regulators and the pertinent design of its first and second stage components, how should a neophyte diver - or even a seasoned diver at that, choose a scuba regulator that incorporates user adjustment and delivers a venturi-assisted air flow in its features? Consider your diving purpose and frequency. Better yet, take note of the following criteria to guide you in your purchase: 1. The Scuba Regulator's Mouthpiece. Check the specifications if the regulator is outfitted with a patented orthodontic mouthpiece. This implies that it is ergonomically-designed to accommodate an overbite or underbite by the human mouth. An ergonomic mouthpiece helps reduce fatigue in the mouth and jaw area, particularly in the cruise of lower depths and extended dives. 2. User Adjustment Settings. There are optimally-designed scuba regulators that are outfitted with adjustment levers to therefore allow divers to finetune valve settings in order to provide the least possible inhalation effort throughout the dive. One notable scuba equipment is the Aeris AT 400 Pro Regulator that is equipped with an adjustable second stage. 3. Weight of the Scuba Regulator. Visualize yourself on a dive and using just any other type of scuba regulator. Is the regulator bulky to considerably increase drag and cause jaw fatigue or is it buoyant enough for you to carry around with your mouth? Lightweight scuba regulators use polycarbonate thermoplastics for its housing to make the scuba equipment compact, sturdy and corrosion-resistant that makes them fit for extended use. 4. Nitrox Compatibility. This entails an ocular inspection of the cylinder tank (Nitrogen and Oxygen proportions) and scuba regulator (Nitrox compatibility) specifications. As a matter of convention, most regulators are suited for nitrox mixture use out of the box; containing the standard, maximum proportion of 40% Oxygen (in terms of volume) but then again, there are gas mixes supporting leaner proportions of oxygen such as the trimix. Therefore, check if the scuba regulator supports the gas mixture configured for your diving cylinder prior to purchase. 5. No-Contaminant Feature. As much as possible, choose a diving regulator that has been manufactured using Dry Valve Technology (DVT). DVT operates through an automatic valve that prevents contamination of the first stage mechanism to thus prevent regulator flooding and the entry of moisture or dust particles. This likely improves scuba regulator performance and extends its useful life. 6. Air-Sharing Feature. This feature often associated with octopus regulators (used as a spare demand valve or alternate second stage) will prove to be most helpful during diving emergencies such as a free flow or during diver rescues. High performance octopus regulators such as the Aeris Gyro Octopus Regulator are designed lightweight and with air-sharing feature, while sporting an inline swivel for convenience mounting and flexibility

Dec 01, 2008 | ACCO Brands Apollo Bio-Filter Moisture...

1 Answer

Do I need a scuba regulator and if so, how do I know which one to buy?


"Because the scuba regulator is such a vital piece of gear many scuba divers choose to buy their own scuba regulator instead of renting one from the dive shop. When a scuba diver has used a few different scuba regulators, on numerous dives, he will notice that they all have slightly different ""action"" - some feel looser or tighter, some will deliver air more forcefully, others will have a slight ""suck"" to them. The goal of all regulators is the same: to deliver air on demand at ambient pressure. Comfort with a scuba regulator depends on how the diver breathes; which is different for everyone. Though a helpful clerk at the dive gear shop can recommend ""the best"" regulators, from the most respected manufacturers, in truth no one can tell you which regulator ""feels right"", except you. Sponsor Links [what's this?] As a novice scuba diver renting or borrowing equipment from a dive shop always take note of what scuba regulator you are using and whether you like how it feels. When you find the one which makes your breathing feel effortless remember its make and model. When you decide to buy your own scuba regulator you will know which one to get. When shopping for a scuba regulator here are some things to consider: See our choices for scuba regulators * Ergonomic design and easy to hold * A purge button which is easily pressed even when wearing 6mm neoprene gloves * External controls which let you make fine adjustments to air flow * Non-corroding metals like titanium or chromed brass * Diaphragm vs. piston mechanics. Many divers prefer diaphragm regulators for its smooth movement and its moving parts are less * Balanced vs. unbalanced regulators. Almost all regulators are balanced. Do not buy an unbalanced regulator. * Always buy new. Do not pick up a cheap second-hand regulator; it may be faulty or reconditioned * Look for a warranty * Swivel joints on the second stage offer improved ease of movement * Hose should be soft and flexible "

Dec 01, 2008 | ACCO Brands Apollo Bio-Filter Moisture...

1 Answer

Do I need a scuba regulator and if so, how do I know which one to buy?


"Because the scuba regulator is such a vital piece of gear many scuba divers choose to buy their own scuba regulator instead of renting one from the dive shop. When a scuba diver has used a few different scuba regulators, on numerous dives, he will notice that they all have slightly different ""action"" - some feel looser or tighter, some will deliver air more forcefully, others will have a slight ""suck"" to them. The goal of all regulators is the same: to deliver air on demand at ambient pressure. Comfort with a scuba regulator depends on how the diver breathes; which is different for everyone. Though a helpful clerk at the dive gear shop can recommend ""the best"" regulators, from the most respected manufacturers, in truth no one can tell you which regulator ""feels right"", except you. Sponsor Links [what's this?] As a novice scuba diver renting or borrowing equipment from a dive shop always take note of what scuba regulator you are using and whether you like how it feels. When you find the one which makes your breathing feel effortless remember its make and model. When you decide to buy your own scuba regulator you will know which one to get. When shopping for a scuba regulator here are some things to consider: See our choices for scuba regulators * Ergonomic design and easy to hold * A purge button which is easily pressed even when wearing 6mm neoprene gloves * External controls which let you make fine adjustments to air flow * Non-corroding metals like titanium or chromed brass * Diaphragm vs. piston mechanics. Many divers prefer diaphragm regulators for its smooth movement and its moving parts are less * Balanced vs. unbalanced regulators. Almost all regulators are balanced. Do not buy an unbalanced regulator. * Always buy new. Do not pick up a cheap second-hand regulator; it may be faulty or reconditioned * Look for a warranty * Swivel joints on the second stage offer improved ease of movement * Hose should be soft and flexible "

Dec 01, 2008 | ACCO Brands Apollo Bio-Filter Moisture...

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