Diving Two Hose Regulators: Questions

[Bob3]

Don't need to do anything special to the clunkers as long as you don't go over 40%, & you may as well use a newer reg to hang on a deco bottle.

 

[pescador775]

About the HP adapters for the AquaMaster. These are called 'tongue' adapters or 'banjo' adapters. They are made of chrome plated brass, fit 3/8" hose connectors and are shaped to fit the old style USD 1/2" valves or Spanish made Nemrod valves. Other valves may not offer clearance. They employ a special thin O ring which fits loosely in the adapter and has a tendency to fall out. In order to prevent this the adapter and O ring must be rinsed in trichor or equivalent, then the ring is glued in place with a small amount of dry suit cement. In use, the adapter must be placed on the valve FIRST, angled down and to the side, then the regulator is slipped over and tightened in the normal way. There is nothing particularly 'weak' in this arrangement but the adapter must be protected from abuse at all times including transportation. Be careful that the regulator is aligned with the adapter or the rim could be dented when tightening.

About the 'round label'. This came into production in 1971. The earliest ones can be recognized by the serial number but also by the appearance of the regulator box front. Looking inside the box, one can see that the front was originally a square label complete with tab slots which had been restamped to accept the round label.

 

[pescador775]

About the LP port. This port is angled to the top right and uses a 1/4" oxygen nut. Otherwise, this port is identical in every way to LP ports on single hose regulators and may be used in the same manner as needed. If LP air is required on the diver's left side which is often the case, it is necessary to fabricate a simple adapter for use with 3/8" low pressure hoses common in today's industry. Purchase a 1/4" 90 deg oxygen adapter from a welding shop. Cut off the male thread. Drill and tap to 3/8" O ring. At this point, any normal LP hose can be screwed in and will snake to the top left. I believe that a permanent 90 deg fitting is also available should one wish to cut off the hose and have it crimped on.

 

[Wildstar1063]

I understand that some of the Nemrod Snark III's have both
HP and LP fittings on them, any idea how to to tell which
do and which ones dont? (Especially if you are looking at the
poorly shot pictures on eBay).

How do these regs compare with the US divers Regs?

What is the spare parts availability for these like?


Thanks

Wildstar1063 (AKA Chuck E.)

 

[pescador775]

The Nemrod is a heavy duty regulator with thick maincasting and tough hoses. The parts, such as exhaust valve and check valves are neoprene and subject to regular service. They would have to be fabricated from similar parts or made from scratch. The check valves can be made from thin silicone sheet and SS screws. I am not aware of any source for the HP and LP seats or the overpressure relief valve. The HP port is located on the right side next to the inlet/yokescrew. The LP port is located higher near the centerline of the reg. Regs with HP port were made from 1973 on. I'm not sure when the LP port was installed. If the regulator has a HP port but no LP port one can be fabricated. Disassemble the reg. Using a milling machine, mill a flat on the left side of the LP chamber. Drill and tap the left side of the LP chamber to 3/8-24 O ring. Reassemble the regulator. Suggest you contact Dan at Vintage Scuba Supply for more info on parts.

 

[Wildstar1063]

Is anyone making aftermarket Diaphrams, or
are we still relying on NOS stuff for those
parts.

I wonder what the shelf life is for those unused Rubber/Neoprene parts are?

Wildstar1063 (AKA Chuck E.)

 

[Scubaroo]

Here's a source for diaphrams:

http://www.goingunder.net

Scroll down to "Vintage Gear", and have a poke around. They're $30 each new, but it's not specified for which regulators they are suited.

This site is hoping to have some fabric-style diaphrams available soon as well - this is the company that supplies the reproduction parts to Vintage Scuba Supply out of the UK:

http://mysite.freeserve.com/www.vintageaqualungs/Hoses.htm

 

[pescador775]

USD coated replacement parts with talcum. The shelf life for a diaphragm is 100 years, hoses, 50 years, duckbills, 50 years, neoprene check valves, 20 years, silicone check valves, 100 years. storage temps 0-80degF. Also, long term storage must be in sealed plastic bag. Checkvalves must be stored upright, flat side down on paper or cloth, not touching any silicone or hydrocarbon such as rubber or hard plastic and no metal of any kind.

 

[Bob3]

Trident has the little "button" valves (like purge valves, double hose check valves) in different sizes, 18, 20,22, 28,29, & 33 mm.
(My double hose parts are packed in storage, can't get at one to measure).

 

[pescador775]

The USD check valve is 1 1/8" dia. The crucial distance to anchor point is 1/4".