-
Faucet Washers
The slop sink in the rental house developed a drip and, unlike our kitchen faucet, required only a new washer. Of course, choosing the right size from that assortment posed a bit of a problem:

Slop sink valve with washers The old washer is in the upper right; you can see the indentation from the valve seat.
There’s a variety of sizes & shapes; these represent just the closest matches. I have no idea what 3/8, 3/8R, and 3/8L might signify, but they’re all slightly different, some with conical cross-sections that may also be slightly different. Worst case, of course, you can sand down the rim of a too-large washer to make the diameter come out right.
[Update: a table of sizes mentioned in the comments.]
The washer just in front of the old one has information molded right into the back:
GOLDEN STATE 10¢ 1/2. Now there’s a show of confidence in price stability that you don’t see much any more!I found one that fit snugly in the recess of the valve stem, turned the screw tight, and it’s all good.