MOSFET Aluminium Regulator with Bypass Triumph ModelsSERIES regulators run much cooler than the Shunt and MOSFET voltage regulator rectifier and way much cooler than OEM parts. Moreover, the regulator has our new machined billet aluminium casing which dissipates heat 33% better than standard moulded casing. Features: Power only flows through the electrical components when the battery is charging. Allows the stator to have lower current flowing when not used, extending its lifetime. Improved Heavy Duty