Rebuild, don't rebuy. Nothing beats the smooth feel and sealing quality of a pump with a leather gasket. O-ring seal pumps struggle with heat and often cannot seal after pumping just a few tires once the barrel gets hot. Since the 1960's all #Silca leather gaskets have come from the same leather converting house in the fashion district of Milan, Italy. For more than 5 decades the same supplier has cut these washers from the excess material left over from the production of exotic handbags, Italian luxury cars interiors, and high-fashion luggage. A small press is used to trim and pressure-form these leather washers into durable pressure gaskets.