The topeak presta valve extender is manufactured from machined aircraft aluminium and comes with rubber seal the presta valve extender is available in two sizes standard 43cm or extra long 78cm the extra long extender fits deep dish and carbon rims from 60mm 90mm topeak presta valve extender standard features 34g standard 43cm topeak about the brand topeak is the world leader in developing and producing innovative accessories designed to make cycling more convenient more acce