Silicone Blanking Caps SamcoSport is the world leader in silicone hose technology. Our range of Blanking Caps are produced to the same high quality as our hoses and can be used in a variety of applications. 6.5 6.5mm (¼") I.D. x 30mm (13/16") long 8 8mm (5/16") I.D. x 30mm (13/16") long 9.5 9.5mm (⅜") I.D. x 30mm (13/16") long 11 11mm (7/16") I.D. x 30mm (13/16") long 13 13mm (½") I.D. x 30mm (13/16") long 16 16mm (⅝") I.D. x 30mm (13/16") long 18 18mm (45/64") I.D. x 30mm (13/16") long 19 19mm (¾") I.D. x 30mm (13/16") long 20 20mm (25/32") I.D. x 30mm (13/16") long 22 22mm (⅞") I.D. x 30mm (13/16") long