Standard washer is compatible with standard garden hose couplings. Features outer diameter tabs to center and retain washer in the coupling. For non-potable water applications.
OD = 1"; ID = 11/16"
Recessed washer is for use with 1/2" garden hose has an internal flange which is supported by some brass garden hose fittings.
• OD = 1"; ID = 1/2"
• High performance rubber resists hardening and cracking
Note: Garden hoses come in several (internal) hose diameters - 1/2", 5/8", and 3/4", but the end fittings are the same size on all of them — they all have to be able to fit on a standard water spigot/faucet.