Nipples?

[steveharriss]

For the knowledgeable amongst the forum. What are the standard scuba fittings in the UK. Particularly the standard thread for attaching an LP hose to a second stage and the threads for the dry-suit inflator nipple/bcd. I only ask as I want to change all my fittings to CEJN but don't know what sizes to order so I can fit QD's to them. TIA

[Woz]

Seatec are the "standard" ones. CEJN commercial fittings are the "fat" ones. CEJN easy to disconnect but have a very high flow through them so if the button sticks, you'll get alot of gas very fast.

I use CEJN on my suit (and "feather" the button rather than press it hard down) and Seatec on my wing.

Oh and AP Valves is a "not quite" Seatec fitting. Bloody annoying.

[steveharriss]

But does a hose for a seatec fit a cejn, and vice versa? thread sizes?

[steveharriss]

http://www.tom-parker.co.uk/file/pro...s_file-210.pdf
What part numbers would allow me to change my BCD and a second stage to QD?

[Digger]

All the nips on that page are CEJN. You can use them for suit and wing, because they have a valve in them anyhow, but you can't use them for second stages because the nipple doesn't stop water getting in. So if you disconnected it underwater you'd get a load of water in the inside of your reg. Not the end of the world really, but not the best idea.

If you want to use the same fitting for your second stages and wing and suit inflator what you need is to use the Seatec nipple and use a scubapro converter on reg hoses for the lengths you need. I do this where possible, and it cuts down on spares. Plus you can make inflator hoses any length you've got reg hoses.

You can get seatec nipples from Sub Aqua Products, and you can get reusable hose ends from them too I think. Very handy.

Digs.

[aquaholic]

Steve,

But does a hose for a seatec fit a cejn, and vice versa? thread sizes?

No.

male thread in suit and wing inflates is usually 3/8" BSP
Female thread onto e.g. a second stage is 9/16" BSP - me thinks..

You can fit the CEJN nipple to a second stage if you add a flowstop in between to stop water getting into the reg if you need to change hoses. Works fine on my KISS. If you buy the wing inflation nipples you might have to drill out the hole as it is too restricted to breathe from, or buy adapters from OceanReef/Interspiro for their FFM.


You might want to consider keeping seatec fittings on the wing and suit, if that is what the people around you have.. makes getting inflation gas from a buddy easier, and still gives you a level of redundancy for inflation hoses.

I have seatec on my wing and suit, and CEJN on any breathing equipment.. Would also stop me plugging in my argon to my reg as well . If you get the adapters that convert a standard reg hose to a nipple receptor [-oo..errrr] you can carry one for seatec and one for Cejn and be covered for either failure...

Best

Anke

[Digger]

I'm just not convinced of the advantage of being able to remove a second stage. I currently have an AP quick disconnect for my rebreather as it's a second stage attached to me, and a tank I often need to remove. Other than that I don't see the gain.

That said, I am thinking about putting a hose on the O2 of the unit so I can access it through the BOV reg. But then I'd end up putting them on everything, which is a lot of hoses.

Digs.

[Northern Barry]

Being thick as pigs, ive got AP valves (rebreather type) on my Custom divers twin, and think they may be wrong....what should they be and do AP sell them....would like to just screw them straight in myself.

Cheers Baz

[Digger]

Barry, can you explain that again? Didn't quite get what you're after. Do you mean you've got quick disconnects on your wing? If so that's possible, as the disconnects use Auto-Air hoses, just the same, so you could have that, but not sure if that's what you mean.

You can screw most nips in yourself, they have a flat side or are hex so you can stick a spanner around them and just unscrew. Then screw in your new one, not too tight, and off you go. You've know if you've got it wrong because it will leak. And it will be obvious.

Digs.

[steveharriss]

Thanks everyone, really helpful

Steve