NIKRO 862031 Button Lock Brush Core Reverse Spinning Nozzle The remote (POA) air manifold 1 2 NPT Connections The remote (POA) air manifold assembly becomes your NIOSH respirator attachment point & is limited to 300 feet (maximum) of air breathing hose at your air outlet's fitting located on the POA box * When ordering D ring anchorage plate with 316 stainless steel D ring and plate making it useful for replacing a worn or damaged brush core while retaining the rest of the compatible system The NIKRO 862031 Button Lock Brush Core is a replacement brush core designed for NIKRO button lock rotary brush systems used in professional air duct cleaning