Hose Fittings/Hose Type

[Konrad harmon]

I have crimping tools and access to fittings galore due to my job.

The question that I can't seem to answer is what are all the fittings that are used in scuba?

Looking around here I have found some stuff but it doesn't make it crystal clear what the call outs are.

If you know the type of fitting for any of the hoses generally used in scuba I would be obliged if we could collect them here. Also any companies that source the fittings in SS and CP/Brass.

 

[Konrad harmon]

Answering my own question a bit. Yay free time and Google.

https://divelab.com/wp-content/uploads/2020/06/Scuba-Hose-Fittings-Custom-Assemblies.pdf

Low pressure hose is generally 5/16" ID with 500psi working pressure per EN 250-2014 Burst pressure >2000psi

Large bore LP fitting is 1/2"-20

Small bore LP fitting is 3/8"-24

Could use some explanation of what the difference is. Assuming large bore is old school?

 

[Konrad harmon]

Oh forgot the other end.

Two types of regulators (new to me)

AGA regulators use AGA fitting? need more info.

9/16"-18 female used for most regulators?

 

[Konrad harmon]

Looks like all the thread types are UNF.

Also found a Scubaboard post that has a bit of info on making hoses. Making your own hoses

 

[lowwall]

Buying Scuba Diving Hoses - The Scuba Doctor

The 1/2" LP first stage ports are mostly found on older high performance regs such as variations of the Mares 22. It didn't make a noticeable difference in real life situations, but was good for stunts like Mares' record of having 101 divers breathing off a single MR22.

 

[Konrad harmon]

Buying Scuba Diving Hoses - The Scuba Doctor

The 1/2" LP first stage ports are mostly found on older high performance regs such as variations of the Mares 22. It didn't make a noticeable difference in real life situations, but was good for stunts like Mares' record of having 101 divers breathing off a single MR22.

Awesome. That helps to solidify my observations.

Also found crimp ferrules from an oxygen hose supplier. Looks like you can get a ton of them for cheap if you planned to reuse the barb fittings. Ferrules

If only I could find the barb fittings with UNF threads. Right now I would have to cut and reuse fittings. would hate to ding a barb with a razor. Also not sure any of this is correct yet.

 

[Konrad harmon]

Anyone know what parker series is used? Pretty sure I narrowed the male hose end down to 105**-6-6C. ** Is the series.

A few of the series have a 1/4" option instead of 5/16" hose. Anyone have qualitative experience with 1/4" hose or 3/8”? It can support the volume, but might have low IP.

 

[Konrad harmon]

Looks like Gates make scuba fittings for the low pressure side. They are the only ones that I can find that you can buy. min order is 50 pcs so the cost of entry is quite steep.

Not to mention the hose buy in and then finding the other side of the hose.
33HB Divers stems | Gates Corporation

 

[Umuntu]

It’s also possible to buy reusable low pressure fittings. Two companies in the UK make and sell these.

Undersea Centre LTD (interesting catalog)
http://www.undersea-centre.co.uk/
[ Narked at 90 also retails Undersea fittings
3/8th UNF Reusable hose fitting ]


and

AP Diving
Search results for: 'Reusable Hose fittings' | AP Diving

A bit more expensive than the cut and crimp approach if you already have the crimping tools. But much simpler to do, especially the AP Diving fittings, which only need two spanners to fit.

I have a couple of sets of the AP Diving fittings on my hoses.