PARTS AND ACCESSORIES › SILCA HIRO Presta Chuck - Grips Presta Valves Tightly for No-Leak Pumping Image 1 of 2 Image 2 of 2 SILCA HIRO Presta Chuck - Grips Presta Valves Tightly for No-Leak Pumping $111.00 SILCA's HIRO Presta chuck grips Presta valves tightly for leak-free pumping.Locks onto Presta valvesNo-leak sealUpgrade for floor pumps Purchase Added! SILCA's HIRO Presta chuck grips Presta valves tightly for leak-free pumping.Locks onto Presta valvesNo-leak sealUpgrade for floor pumps