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This may help: http://stuffo.howstuffworks.com/scuba1.htm Look about halfway down the page at the working diagram of the secondary stage; the opening with the exhaust valve in it is the exhaust port, or part of the exhaust port. On the outside there may be an exhaust housing or deflector as...

I don't know if there are any regulators that are actually well designed for this particular function, but I wonder if you shouldn't revisit the decision to blow through the regulator in the first place. Cancun Mark's answer makes sense to me, but even with a larger exhaust port, isn't there a...

The JetFins are negative, but not negative enough to affect your trim, I don't think. I remember asking in some other thread whether steel spring straps might add a little bit of weight to the fins (in response to somebody who was asking about using ankle weights), but don't remember anybody...

I started out with Scubapro JetFins and dove with nothing else for decades. Last year, I bought my first pair of split fins (the Atomic Liquid Blue). I like them both, but they are very different fins. I don't think I would start out with the split fins, because they are much more expensive...

Rocky Point is close, but is not a particularly attractive dive spot - it is right at the top of the Sea of Cortez, and the tidal action is enormous. So there's lots of sandy beaches and stirred up sediment and the like. I am still looking for decent dive spots in the area - and if you come...

Terry, those are all good points, but I think I'm inclined to agree with Miketsp. First, because somebody ought to account for the LOA diver's buddy, anyway - and because you shouldn't take off leaving your own behind without letting them know what's going on. I wouldn't assume that somebody...

I think the referral idea sounds like a good one, and - although it may make it harder to maintain the surprise - if it has been some time since your husband was diving, a refresher course would also be a good idea to remind him of some of the stuff that he may not have been thinking about for a...

I wouldn't worry if I thought the regulator was of a type that I was otherwise satisfied with (that is, one that I would also want to own if I was buying it new). There are some good regulators in rental service (e.g., Aqualung Titans) and if they are not too old and have been maintained and...

I was just buddies with a young man who had just purchased one of those masks. They *will* fog to some extent like other masks, and you will want to use something to defog them in ordinary use, but the people who sold him his mask (also a dive shop here in Arizona) were adamant that he should...

Do you mean the *chances* are just about the same, or that it's pretty much the same experience (i.e., just as much fun)?

I think those are all important considerations, but it seems to me the particular problem in the story as you describe it turns mostly on point no. 3 (and then maybe the strength of the current). Whether a person is a new diver or experienced, you can't go diving in a place where you can't...

I agree with Herman, because there is a big difference between a diver with ten years experience, and a diver with one year of experience repeated ten times. Dive more, but dive with a purpose - and the purpose is to get your weight and trim right, master your buoyancy, and get comfortable and...

There are a variety of hex threaded bushings available in 304 stainless (and maybe other alloys as well) here: http://www.onlinemetals.com/merchant.cfm?id=556&step=2

I don't know how you arrived at these suggestions, and don't know enough about some of these specific products to comment on them, but ... If you haven't already, I would read three articles on Rodale's site about how much to spend on a regulator, another rating some budget regulators, and a...

Just for clarity - you may be correct about the end result, but to better explain how you get there - the AL80 you're talking about is a HP tank that is neutral when empty, correct? So strictly speaking you're not adding weight to compensate for the buoyancy of that tank, because it is never...

And the only reason black dominated over all of those other colors is the same reason that tires were black - the molecules in rubber exposed to sunlight were broken down by UV exposure and the rubber became brittle and cracked. Carbon black protected the rubber against UV radiation, and also...

I don't know if there is a more recent edition; mine is from 1998.

In fact, now that I have gone back upthread to remind myself of the name of the ship, here it is - 26 feet draft. http://cruises.affordabletours.com/Carnival_Cruises/Inspiration/

From the pictures I saw of the cruise ship in question, it looks like one of those new jobs and probably has a draft of about 25-30' or thereabouts. And at that it won't do you that much good if it passes over you and also sucks you up into the propellors, so you have a lot to worry about even...

It is something that you will be taught how to "fix" in a beginning SCUBA class. The problem is a very simple one; as you descend, the pressure of the water around you increases, until it gets to be much greater than the pressure of the air inside your head (not just in your inner ears, but in...