With few exceptions, the bypass is neither field adjustable or replaceable by itself. For low pressure (return) filters, the bypass is located in the element. In this case it is only necessary to change the element and the indicator (the indicator should be selected to trip at 1 bar or 14 psid below the bypass cracking pressure). For high pressure filters, the bypass is located in the filter head. Therefore it will be necessary to change-out the head as well as the indicator. In both instances, we would recommend that the filter nameplate be changed to reflect the filter modifications and that the seals be replaced at time of change-out. Note, low pressure (return) filters will have an ‘R’, ‘RK’, or ‘RN’ in the replacement element model code and pressure filters will have a ‘D’ or ‘DN’ in the replacement element model code.