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The H life raft hasn't been made in at least 8 possibly 10 years now

Mudbug is joking about asses and assumptions. The 4 characters in a square format RIN is only for US DOT hydrostamps. Canadian stamps are reciprocally accepted and their database is here Transport Canada Registered Means of Containment Facilities Probably doesn't apply to the OP but at least...

Sadly these never had allowable expansion stamped on them so it's nearly impossible (but not completely impossible) to get a + stamp renewed

Yeah maybe? Lol @Externet 's whole initial question is a mess

You only need one spg (or transmitter) on a set of doubles

Backup lights are clipped to the shoulder Drings too, and on your left shoulder Dring there are stages and deco bottles as well - all things you actually use underwater (unlike a whistle). The more crap you have clipped there the more likely you are to unclip the wrong thing or get all those...

He's talking about CGA 580 valves not scuba valves (well maybe not - but it's confusing since CGA 580 is an inert gas valve yet the rest of the OP's questions seem to be about scuba valves). There are fat and skinny threaded CGA 580s and they are also available in 0.75" UNF. But 0.75" UNF is a...

OPVs are the single most likely failure point in scuba. It's a tiny, tiny bit of nylon the size of a pinhead behind a SS spring - all exposed to salt, seawater, and HP O2. They fail - more often than nearly any other regulator part

In a drysuit with fluffy undergarments you'll be in a very bad uncontrolled ascent and quite possibly embolize - which is nearly always fatal

It will cause an issue when you least need it - like on a deep, no light on the bottom, deco dive when you *really* need a backup light to signal your buddy.

There is no "immediate" need for a whistle, put the dangly stuff on a bolt snap in your pocket.

An 6, 8 or 10lb weight belt is the simplest hogarthian way.

If the IP goes sky high on the 1st the BOV is going to vent that gas, the OPV is just another place to leak.

Have you resolved the corporate liabilities for the lead and arsenic releases?

anything elastic hates to stay tied and only gets worse with water. 2 drops of Superglue or similar will solve all your problems simply

Single fisherman's knot with superglue on it to lock the nylon casing to itself.

The US DOT specifications for 3AL cylinders require: "Three samples must be pressurized to destruction and failure may not occur at less than 2.5 times the marked cylinder service pressure. Each cylinder must remain in one piece." The sample size is small though and obviously some cylinders...

They are, in theory, designed and expected to fail without producing shrapnel. Staying one piece is the design goal but it isn't always attained

Just try CLR, the one with the red X, it absolutely does not contain HF. HF is not in any reasonable household product

15% is nothing. Although with <50 dives I'm not sure how big your data set actually is