This is a disc shaped gasket that fits into the screw on cap for older Zodiac/Bombard valves.
NOTE: Thils gasket/seal comes with the cap Z2846
Also used for cap on Nickle plated I/C valves
It is not for the newer semi-flush valves.

Screw on cap with string and gasket is Z2846 llinked below.
Zodiac Valve Parts Diagrams

For diagram of IC Valve part numbers see:
Intercommunicating ( I/C ) valves

Zodiac / Avon Sales and Service

Zodiac Valve cap non-flush valves each

( Part # ZOD Z2846 )

E-Mail sales@shipstore.com with any questions.