Notes on replacing a Torbeck diaphragm washer
Common advice for a continually running toilet fill valve is to dismantle the valve and check for debris. I didn't find any, but the black 32mm rubber washer inside was leaving black residue, which I now suspect was indicative of failure.
The old washer was labelled TOR WPE II C.
The replacement was from Epson (presumably not the printer company), sold at Toolstation under SKU 62694 for £3.95, manufacturer ID RDT02999B-TL, and was labelled TOR XW 6. It came with a small plastic pin, unlike the old one, but this pin could be easily pulled out to turn it into the old style washer.
With old and new in hand, the difference was clear: despite the old washer not looking damaged or worn in any way, it was much more rigid, and the new one was much more pliant. I don't understand why this makes such a difference, but it did: once fitted, the new valve resolved the issue, to my great relief, as I really didn't want to have to unplumb the whole valve fitting.
No tools were required aside from a screwdriver to turn the water off at the isolation valve, so I highly recommend DIYing this cheap fix.
hardware
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I've had to replace the entire tank assembly a few times. The newer systems aren't bad and don't take long but there's still a time investment. glad it was an easy fix
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