Optimal protection of the potable water supply system|Pressure reducing valve with inlet pressure balancing - inlet pressure fluctuation does not influence the outlet pressure|Outlet pressure adjustable and directly visible on the pressure gauge|Low maintenance effort - cartridge insert and valve insert are completely replaceable|1/4 in connection|For use with model NK300S-100, NK300S-100UP boiler feed combination including C and threaded connections|Pressure range - 0 to 87 psi