What does it mean by 3/8" or 1/2" port fitting ? How do I know for my reg?

[work4mike]

I apologize for asking a newbie/silly question here but I can't understand what it means when presented with an option for 3/8" or 1/2" port fitting.

I am trying to buy an Apollo Bio-Micro filter and they come available with 3/8" or 1/2" port fittings. I assume this fits to my 1st stage port. say the LP port right?

I have a reg but never figured out whether they are 3/8 or 1/2 ?

How do I confirm this? Can I simply use a ruler and measure diameter or circumference of the opening of the LP port?

Thanks,

 

[gaschef]

What regs have you got, and I will try and point you in the right direction

regards

Gaschef

 

[Spectre]

Is your LP port smaller [3/8", more common] or larger [1/2", less common] then your HP port?

 

[work4mike]

hi gaschef,

i recently bought 2 1st stages - Oceanic DX4 and an older Aqualung Micra+. The Oceanic DX4 is connected to an Omega II 2nd stage. I am intending to use it primarily with the DX4.

 

[dbg40]

Don't know about those regs in particular, but basically, Look at the port for the primary second stage where it plugs into the first stage. It has either a 1/2'' fitting, or a 3/8'' fitting for the threads. That's about it, if it's the 1/2'' type and you want to swap regs, dont let them talk you into a pricey 1/2'' hose. Just get a 1/2 to 3/8 adaptor and use a standard hose. But most likely you have more common 3/8'' type. Hope this helps.

 

[StSomewhere]

The 1/2" is an Apeks thing and its only on one port. If you don't have an Apeks, I doubt you have a 1/2" port.

 

[dannobee]

See what size wrench fits the hose where it goes into the first stage. The 3/8" hoses generally take a 9/16" or 14mm wrench and the 1/2" hoses take a 5/8" or 17mm wrench. Also, if it's 1/2", the other low pressure hoses will take the smaller wrench, and only one port will have a 1/2" hose.

Apeks, Mares, Zeagle, and Kirby Morgan generally have a 1/2" port (probably others too, but those ones I know for sure).

 

[Don Burke]

On the older USD regs, all of the LP ports are half inch.

 

[scubatoys]

The DX4 is definitely 3/8. Make sure you get the newest version of the bio filter that tightens with an Allen wrench from inside... It's a new mounting system that seem to be more secure and has more swivel movement to it.