Transfill Whip Adapter help

[legal.diver]

I have the "Metalsub Oxygen DIN 200/300 With Flow Control tank equalizer" and I'm looking to change the gauge to a digital pressure gauge but struggling to find an adapter. The digital pressure gauge is a standard 1/4" NPT fitting but I can't find the size of the fitting for the T piece - any ideas? The current gauge on the decanting whip has a weird G1/2" adapter...

 

[davecampbell]

spin the gauge out, and spin in the new digital gauge... having a hard time seeing the problem here. It doesn't matter how the other piece is connected.....

 

[legal.diver]

Thanks. The current gauge has a G 1/2" thread fitting whereas the new digital gauge has a 1/4" NPT fitting so it isn't plug and play.

 

[legal.diver]

This is the current gauge:

"Metalsub Oxygen Classe 1 100 Mm 0-400 Bar pressure gauge
Technical pressure gauge for 100% oxygen, Class 1 in stainless steel.
100mm dial diameter, G1/2´´ thread"

 

[davecampbell]

what is the thread/size of the intermediate brass adapter shown there? it's obviously gonna be g1/2 on the female side (accepting that gauge) but what is the male side?

 

[legal.diver]

That's what i'm struggling to work out. From a quick measurement it looks like 5/8".

I've worked out it's the MetalSub Bonnet Nut Model C but i haven't been able to find the exact size: Metalsub – Equipos de buceo

 

[legal.diver]

what is the thread/size of the intermediate brass adapter shown there? it's obviously gonna be g1/2 on the female side (accepting that gauge) but what is the male side?

I think it's a 11/16"-20UNF Thread so the adapter i'm looking at is a "1/4 NPT female to 11/16 UNF male" which doesn't seem to exist from a quick google.

 

[tbone1004]

I think it's a 11/16"-20UNF Thread so the adapter i'm looking at is a "1/4 NPT female to 11/16 UNF male" which doesn't seem to exist from a quick google.

You may have to keep the brass adapter that's there and add the g1/2 to npt adapter unless you have a friend with a lathe who can make the adapter for you. Adapter is easy to make if you have a lathe

 

[inquis]

I think it's a 11/16"-20UNF Thread so the adapter i'm looking at is a "1/4 NPT female to 11/16 UNF male" which doesn't seem to exist from a quick google.

Does a normal SPG fit? If so, that's 7/16 UNF male. The adapter I needed to put a digital gauge on a Piranha whip was any of these:

• Omniswivel NP-UF-XM-HP $20, chrome plated brass
• Swagelok SS-4-SAE-7-R
• Fitok $13 - 316 SS, Amazon

 

[legal.diver]

You may have to keep the brass adapter that's there and add the g1/2 to npt adapter unless you have a friend with a lathe who can make the adapter for you. Adapter is easy to make if you have a lathe

Does a normal SPG fit? If so, that's 7/16 UNF male. The adapter I needed to put a digital gauge on a Piranha whip was any of these:

• Omniswivel NP-UF-XM-HP $20, chrome plated brass
• Swagelok SS-4-SAE-7-R
• Fitok $13 - 316 SS, Amazon

Unfortunately not...