Why do plumbing washers have letters and numbers on them?

20 Volt Cordless 4-in-1 18-Gauge 2″ Flooring Nailer, 57% OFF

Replacing the washers is an easy and economical alternative to replacing the entire faucet. New washers will return the faucet to like new condition.

5/8 in. Flat Faucet Washers (10-Pack)

20 Volt Cordless 4-in-1 18-Gauge 2″ Flooring Nailer, 57% OFF

20 Volt Cordless 4-in-1 18-Gauge 2″ Flooring Nailer, 57% OFF

DANCO 5/8 in. Flat Faucet Washers (10-Pack) 88574 - The Home Depot

20 Volt Cordless 4-in-1 18-Gauge 2″ Flooring Nailer, 57% OFF

20 Volt Cordless 4-in-1 18-Gauge 2″ Flooring Nailer, 57% OFF

DANCO 5/8 in. Flat Faucet Washers (10-Pack) 88574 - The Home Depot

20 Volt Cordless 4-in-1 18-Gauge 2″ Flooring Nailer, 57% OFF

DANCO 5/8 in. Flat Faucet Washers (10-Pack) 88574 - The Home Depot

20 Volt Cordless 4-in-1 18-Gauge 2″ Flooring Nailer, 57% OFF

20 Volt Cordless 4-in-1 18-Gauge 2″ Flooring Nailer, 57% OFF