Hayward Pro Series Sand Filter S-244T - Leaking out backwash line

[NutmegPool]

Hayward Sand Filter started leaking out of the backwash line when set to Filter or Recirculate.
Initially the gasket was chewed up in the key so we changed the gaskets, still leaking. Then changed out the key on top and
still leaking when set to filter or recirculate. What else should we check? Is there something in the control valve that can be checked?
How do you know if the entire control valve needs to be changed? Thank you.

 

[sktn77a]

You probably have a Hayward SP0714T MPV. They don't recommend trying to replace just the gasket - rather they replace the whole key assembly with the gasket attached at the factory.

Hayward Replacement Key / Seal Assembly for SP0714T Valve (SPX0714CA)

idealwv.com

 

[NutmegPool]

You probably have a Hayward SP0714T MPV. They don't recommend trying to replace just the gasket - rather they replace the whole key assembly with the gasket attached at the factory.

Hayward Replacement Key / Seal Assembly for SP0714T Valve (SPX0714CA)

idealwv.com

Yes, it's an SP0714 T. I purchased this one from Amazon. It's not a Hayward but is compatible. The key turns much easier but is still leaking a little. Not sure if I should buy the Hayward and replace if that will make a difference.