Multi Port Valve Gasket

[aquarium]

Is there a way to repair/replace the gasket in a multi port valve? Seems the gasket is built in and can't be replaced You have to buy the whole assembly

I was told the same load of bull at one pool store - "That'll cost you $150 for the assembly."

Then another plumbing store with a pool section sold me the gasket for $8.

Yeah, make and model would help. If it's a Baker-Hydro, that's the same as a Hayward, gasket-wise.