you sure about that, I just converted mine to 134 and my low side is the large line. Also I found out thanks to Glenn the clutch will not engage if the system is out or very low, due to the low pressure switch. So i have now removed my temporary hot wire to the clutch and everything works great. The low pressure adaptor will only fit on the low side anyway. <img src="/forums/images/graemlins/kewl.gif" alt="" />