One of the secrets to the long term viability of Silca's greatest pumps has been their use of a replaceable high-quality leather gasket, which they believe- and have demonstrated, is a better option than a silicone o-ring or other products with their pump designs.

The #731 Leather Piston Gasket for 28mm internal diameter pump barrels is the most commonly used standard for Silca pumps but there have been other sizes, so makes sure you confirm the size. The gasket should be conditioned before use to keep it flexible and create a great seal, and Silca recommends their NFS Pump Lube, which is also used inside the barrel. It is a good idea to check that the barrel is clean, ensuring there is no sand or even a piece of worn gasket inside before installing a conditioned, new #731 piston gasket onto the pump piston. Silca has a couple of helpful videos on their website to assist you in these processes.