Swivel Spool - What size O-rings?

[drdaddy]

Hello All You Experts,

For my Sherwood (Oceanic looks the same) Air Pressure Gauge I got a backup high pressure "swivel spool" (A142) that already has the O-rings on it to carry in my "save a dive" kit - for those rocky dive boats and the leaky air pressure gauge.

What size O-rings does this take?

I got a got a few R004 O-rings. They look right.

Did I get the right size?

Thank you.

 

[keyshunter]

Most spools use -003

 

[spectrum]

Most spools use -003

And unlike most scuba applications this one wants to be 70 durometer. 90 will be too stiff to stretch into place.