Pressure Replacement Rotary Head O Ring Set for 16" To 24" Surface Cleaners (85.790.004) Is a Complete O-Ring Kit for Rotor Swivel Assembly for Be Stainless Steel Surface Cleaners. It Is Designed for Use On Whirl-A-Way Models Between 16 and 24 Inches In Diameter. Features Can Be Used with Hot Water Up To 450 Degrees. Works On Whirl-A-Way Machines: Be-1600Waw, Be-1800Waw, Be-2000Waw, Be-2000Waws, Be-2200Wawg, Be-2400Waws Whirl-A-Way Flat Surface Cleaners Fits Dragon Tools Rha4005 Models:Sdt-Bsc-W-30, Sdt-Bsc-W-36, Om-Bsc-W-48, Om-Bsc-W-60, Sdt-Psc-20, Sdt-Psc-W-20, Sdt-Psc-3Nsb-20, Sdt-Psc-4Nsb-20, Sdt-Psc-Vp-20, Sdt-Ssc-Ww-18, Sdt-Ssc-Ww-21, Sdt-Ssc-Fsb-21, Sdt-Ssc-Vp-21, Sdt-Ssc-Ww-24, Sdt-Uc20S Vortex, Mi-T-M, Simpson, Twinkle Star, Steel Dragon, Fits Part # Pw85790004 -Does Not Come with Swivel- Replacement O Rings Only PPFSRHA4005