SILCA 323 chuck gasket for Reversible brass chuck and SILCA Impero head

There are at least 3 original SILCA brass chucks that use this gasket as well as the IMPERO frame pump. ¬†However, none of them were as widely sold as the Presta Only chuck and we had been unable to find original 323 gaskets that were unused and in near original condition¬†to assess performance, so the team at SILCA had to completely redesign and optimize this part from scratch. This modern 323 gasket has been developed using the same high-tech fully synthetic elastomer used on our modern 242 gasket on the SuperPista ultimate. ¬†We find that this material allows for greater valve holding power, greater sealing and significantly improved life expectancy. ¬†New 2-stage Seal Design improves high pressure performance and also makes it unnecessary to press the chuck on as far as the original design required.  With a 323 gasket your classic SILCA pump will literally perform BETTER than new!