Smeg Dishwasher Sump Pipe Hose Water Non Return Valve D 23mm140000536015

The dishwasher was not draining properly and coming up with an error 020. After a bit of an investigation, I realised that this rubber non-return valve had bowed slightly so was letting water back in after it had been pumped out. Very easy to replace this once you've worked out how to get all the sides, etc off the dishwasher Thanks to Ransom Spares for prompt delivery, although seems quite pricey for such a simple part.