also just remembered... when i did the head on mine i thought i'd strip the reg down and see what was inside, well i tellu, a load of crap same out when i split it, used some carb cleaner and ran the pump for a split second to purge out any more crap that was lurking in the lines around it, all you need is a pair of internal circlip pliers and a pair of vice grip plier to pull it out as the o rings hold it quite well if its not been distubed before.