Matrix m3 aluminium factory cap kitthe factory cap kit is made from t6 6061 aluminium billet for durability and is a worthy upgrade to any container featuresmaterial t6 6061 aluminium billetadjustable breather equipped with a quick fill hoseexclusive stainless steel cable tether attached fill cap38 larger diameter then the standard plastic fill spoutmachined grooves on caps for easy and smooth grippingbuy matrix accessories at chain reaction cycles the worlds largest online cycling store