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Color is difficult to discern at depth Color is difficult to discern in poor visibility Color is difficult to discern when someone has kicked you in the face with a fin and knocked your mask off and knocked the reg out of your mouth

There have been fatalities including one among a group of divers I know locally. One scenario involves forgetting to open the valve on the main cylinder after testing everything and turning the air off before the dive. This in and of itself is fairly common. Then the diver breathes the pony...

1) You will have trouble getting HP fills in many resort destinations which will limit you to around 19 or 20 cf anyway 2) If you decide to fill it from an AL80 as many people do you will once again limit the contents to the same as you would have in the AL19 3) You will typically need a 2# trim...

As pointed out upthread, SPGs that read incorrectly can be part of an accident chain. It is common for them to off by 100 PSI even when new. Any more than that, or any sticking however minor, and I discard them.

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They think in terms of "cabin altitude." For commercial flights I believe they use 5000 feet as the upper cabin altitude limit. They do not perform pressurized takeoffs or landings, so they will use a higher cabin altitude when the departure or arrival airport is above 5000 feet, as is the...

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I have an extra set of standard 7.25" doubles bands with stainless steel hardware. $50 obo plus shipping. They will fit in a large flat-rate box.

I have some smaller cylinders, 1.5 cf, 9 cf and 11 cf, that I use for soaking regs. Usually dive shops won't charge for a fill for a smaller cylinder that is brought in with a couple larger ones. Or you can use a transfill whip. The smaller cylinder doesn't have to be full to be useful...

I've had these for several years and find that they don't fit my diving style. They are about 9.5# negative when empty. $75 each for tanks including stage hardware (no valves), local pickup or you pay freight. I can ship these UPS to most destinations in the USA for $30-$40 for one tank or...

I was pondering my kit today. It's been five years since I threaded the one-piece webbing harness through my backplate. I used the very stiff, single-layer nylon strapping that is widely used and recommended for the purpose, and have for five years endured having it cut into my shoulders while...

What are the alternatives for obtaining parts and service for DSS gear? In particular: Repair service for wings with leaks Correct replacement parts, such as the elbow and gasket, which has slight dimensional differences from the ones sold by DGX and others that will lead to leaks due to the...

I have never seen a 1/2 NPSM thread on a cylinder and am skeptical that this thread form was actually used. M18x1.5 threads were used on some earlier (1960s) scuba cylinders including some I have had in my possession; I confirmed the thread size by using an M18x1.5 tap as a thread gauge. M18...

I wonder whether some of the threads in this old thread are actually M18.

Poodle jacket with an Air2, dry snorkel, split fins, and a console with the SPG and a compass. I had to hide from scubaboard for a month to allow my self-esteem to recover. :) Actually, I haven't used any rented gear since the pool sessions for OWD.

You may find that gentle heat helps to remove the vinyl. I put one in the oven once. Heat guns also help. Elbow grease still required. I have the cylinders hydroed before investing time and money in them. Some fail Older valves are subject to a variety of maladies and I've started just...

HP air is dangerous, get in-person advice and supervision. Seriously. Especially if there's anything other than air in the cylinder. Wear gloves, hearing protection, and goggles, and make sure the tank is thoroughly secured, most shops would put it in a tank vise before fiddling with it...

In general, there is not a problem with excessive warmth with wetsuits, at least not while diving. (They are a problem topside before/after diving though) The problem with excessively thick material is that it makes it difficult and uncomfortable to move. I am finding that generally I like to...

I have both in various thicknesses. My two piece suits are freediving-type suits with no inner line. Freediving suits particularly do not have zippers or other fasteners which keeps the cost and bulk down and reduces a source of leakage. I do not believe any one-piece freediving suits are...