I'm losing water out of the discharge or waste pipe when the pool is on filter. Took apart my multivalve and it looks like the gasket inside has seen better days. I'm not exactly sure which model I have because the model and serial number are faded out. HOWEVER, I could read the patent number which is 3640310. A quick google search has me thinking that it could be model number SP714TX. I do know for sure that it is a Hayward Vari-Flow. Can anyone help me out with this. I've lost so much water that I had to shut the pump down tonight in order to stop pumping the pool water out. If I can verify the model number, I'm going to call one of the local pool stores that is reasonable on their prices to see if I can find the parts that I need. If that is unsuccessful I will have them overnighted to me. I won't be able to work on the this at all Wednesday night so my next opportunity would be Thursday evening.