FILLER CAP WASHERS ON CLASSIC STOVES. Never trust the filler cap washers on stoves you receive. Even when they look good and un-worn they are usually hard and make a poor seal, and I generally replace mine as a matter of routine now. I currently use some nitrile rubber sheet, 1.5mm thick, which I bought from Ebay and I punch or cut my own washers. I sometimes oblige friends by cutting washers for them, particulaly when a concentric punch is required...the punch sets are expensive to buy. For plain filler cap washers, my punch set is too small, so I draw around the cap and cut out the nitrile disc with a pair of scissors. For NRV pips, I have posted instructions on CCS on how to trepan them from nitrile sheet using a ball-point pen refill and a drill: http://www.cl Best Regards, Kerophile.