Depending on the valve... If a push-pull, the o-rings need to be replaced. If a multi-port (six to 8 position valve) the spider (spoke) gasket is pinched or damaged. Sometimes opening the multi port and re-aligning the gasket will solve it. If a push-pull replace the o-rings...About $12.00 in parts for the push-pull...
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Depending on the valve... If a push-pull, the o-rings need to be replaced. If a multi-port (six to 8 position valve) the spider (spoke) gasket is pinched or damaged. Sometimes opening the multi port and re-aligning the gasket will solve it. If a push-pull replace the o-rings...About $12.00 in parts for the push-pull...