Model 651 combine a filter, regulator and flat gauge for optimal performance. The filter will efficiently remove any moisture or debris and the regulator provides a controlled and consistent air pressure. Thanks to its compact design, it is perfect in applications where space is limited. Model 651, piggyback, for compressed air systems withstand up to 16 bar (232 PSI) inlet pressure. It features a polycarbonate bowl, easily visible level indicators, flexible rolling diaphragm for extended life and a locking device. Application: Virtually every industry, e.g. manufacturing, food, processing, carpentry, paper mills, etc., relies on compressed air as an energy source. In a shared compressed air network, with numerous outlets and an extensive pipework system, air preparation units are especially important.