NA275843 is an extension piece (extension wand/lance) used for pressure washers, specifically for the following models :
Black & Decker BEPW1300 Type 1 Pressure Washer
Black & Decker BEPW1300L Type 1 Pressure Washer
Black & Decker BEPW1700 Type 1 Pressure Washer
Black & Decker BEPW2000 Type 1 Pressure Washer