Odd whooshing noise

[botty1963]

Would anyone be able to tell me which replacement part I would need, this is the current one and it just clips in to the base, one clip each side.

 

[jeff the gasman]

The white silocone washer on the left. Or the complete valve.
Look on fixthebog.co.uk for the same valve.
If the existing washer has pimples, pop them with a pin and squash the water out until flat.

Fluidmaster PRO820UK Dual Flush Valve

Professional mechanical dual flush valve for 2″ outlets with adjustable volumes and overflow.

plumbinbits.co.uk

 

[botty1963]

The white silocone washer on the left. Or the complete valve.
Look on fixthebog.co.uk for the same valve.
If the existing washer has pimples, pop them with a pin and squash the water out until flat.

Fluidmaster PRO820UK Dual Flush Valve

Professional mechanical dual flush valve for 2″ outlets with adjustable volumes and overflow.

plumbinbits.co.uk

Thanks, I had tried turning the washer around as it didn't look that flat, but that made no difference. I will give what you suggested a try, and then see what I need to order. Many thanks'

 

[botty1963]

Thanks, I had tried turning the washer around as it didn't look that flat, but that made no difference. I will give what you suggested a try, and then see what I need to order. Many thanks'

Many thanks, I replaced the large silicone washer and the issue us now resolved. Very much appreciated.