The washer will require gentle stretching over the upstanding lip on the carrier plate to fit. The washer is quite flexible.

Part Code
AE021
Price
£1.95
Washer, sealing, base of 1-shot lubrication pump
Washer, sealing, base of 1-shot lubrication pump
Washer, sealing, base of 1-shot lubrication pump
Washer, sealing, base of 1-shot lubrication pump