Identify These Regs/ Recommend 1st Stage?

[diversteve]

Purchased the Hollis DC3 212...

When you need to service it - non-OEM parts:
Hollis Service Kit - DC1/2/3/4 Yoke First Stage - Northeast Scuba Supply Store
Hollis Service Kit - 212/21/321 Non-Swivel Second Stage - Northeast Scuba Supply Store

People recommend the Vance Harlow/Airspeed Press book also. SCUBA REGULATOR MAINTENANCE AND REPAIR by Vance Harlow

 

[Breakzilla]

If I recall correctly, the quarry got to 42 degrees at about 46ft during our OW certification. I don't know if the rental gear provided was environmentally sealed or not. My girlfriend just picked up an oceanic Alpha 9 with an SP-5 1st and I'm a little concerned that perhaps it's not the best choice for cold water.


Sent from my iPhone using Tapatalk

---------- Post added May 28th, 2014 at 04:28 PM ----------

One more question: Does anyone know if the orange octo above is Nitrox capable?


Sent from my iPhone using Tapatalk

 

[ams511]

As to the 2 octos you have, there may be another issue using them as primary seconds. I do not know for sure on these but some manuf used different springs in their seconds that were sold as octos. These springs are slightly stiffer than those sold for the same second stage that was intended for primary use. Even if service parts are easy to some by, the springs may not be.

I have seen you mention this before but for how many modern regs is this a problem? My understanding was stiffer springs were used in older regulators (from the 60s and 70s) with non-adjustable orifices. These regulators appear to be from the 90s.

 

[Fishpie]

The older round Sherwood octo's were also different from their primarys in that the demander lever fulcrum point was curved rather than flat.....or was it the other way round?


OP.....The MK 5 can be packed with grease if you have the spec model with the small ambient holes and then get hold of a 109 metal 2nd stage.

 

[ams511]

The MK 5 can be packed with grease if you have the spec model with the small ambient holes and then get hold of a 109 metal 2nd stage.

So can some of the older MK-10s.