Need Classic Chugger Pump O-Ring specs

Ended up ruining the clear/white silicone housing o-ring in my classic Chugger pump. I find a few places online selling the o-ring for, IMO, absurd prices.

Anyone know the o-ring specs? Looks to me maybe 2.5 ID and 2 11/16 OD.

Anyone have a source, maybe McMaster-Carr, etc, for a pack of them?

Thanks.

See if this works. McMaster-Carr

“This from a post by Walter at March pumps in 2011 on another site: You can get one from McMaster…its the same as our’s. Look for an ASA -036 which is a 2-3/8"ID with a 2-1/2"OD with a 1/16"CS and you can pick what ever material you want from McMaster or any other supplier. Ours are normally silicon rubber.

-Walter”

Thanks, but unfortunately, no. These are for March pumps. Don’t work in the Chugger.

The Chugger part is CP-23, but I’m sure someone have a better price than $1.99 each.