1 Allis Chalmers 42-65 Superior Primary Gyratory Dust Seal Ring PN 17-202-360-001. Product ID: Allis Chalmers 42-65 Superior Primary Gyratory Dust Seal Ring PN 17-202-360-001.Product description: Allis Chalmers 42-65 Superior Primary Gyratory Dust Seal Ring PN 17-202-360-001. Attachment Inquiry