I’m looking for a source for replacement tapered seals / washers for a sink trap, where the overflow connects (I think the appliance connections are similar). It’s exactly the same style as the tapered seals for the main waste connection, except smaller. The larger ones are widely available (e.g. https://www.screwfix.com/p/floplast-32mm-trap-seal-kit-packet-4-pcs) but I can’t see smaller ones (about 25mm washer internal diameter I think) anywhere. Any suggestions anyone?