The large knob on my C2 Thetford cassette porta potti has become almost imposible to turn when emptying the bowl for flushing. When it does turn it goes suddenly.
Hi! Spray blade which closes holding tank with silicone spray. Make sure spray goes under lip of sealing ring. Also spray around holding tank actuator knob allowing to penetrate underneath to shaft. Don't use a silicone grease as this will gum up the works. If you can't get hold of a light silicone spray try using household type silicone polish intended for furniture. Wipe off any surplus as only thin film required.
John Long
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