The Beckett 52000U Adjustment Mechanism Kit is a replacement head and air adjustment assembly designed for Beckett NX Series oil burners used in residential and commercial heating equipment. It provides precise control of the burner head position and combustion air setting through an adjustment screw, pointer, and locking mechanism. Proper adjustment helps maintain the air-to-fuel bal... https://www.partshnc.com/52000u-beckett-igniter-kit-nx-adjustment-mech