Air Compressor Piston Rings | 42mm to 120mm | 3 or 4 Ring Sets

These air compressor piston rings come as a ring set for the pump head, in diameters from 42mm to 120mm, and restore the seal between piston and cylinder wall when a worn set has let compression drop. The supplier lists 3 balance and seal ring contents as 2 balance rings and 1 seal ring for the 42mm to 90mm sizes, and 2 balance rings and 2 seal rings for the 90mm and 100mm sizes. Pick the diameter and ring count that match your piston in the options. Features and benefits: - 16 option sizes from 42mm to 120mm - covers small single cylinder pumps up to larger heads - Three ring and four ring versions - choose the ring count that suits your piston - Supplier lists 2 balance rings and 1 seal ring for the 42mm, 47mm, 51mm, 65mm, 80mm and 90mm sizes - Supplier lists 2 balance rings and 2 seal rings for the 90mm and 100mm sizes - Sold as a set, so the rings you need for one piston arrive together - Matching a ring set to the piston bore is the key check before ordering Applications: - Rebuilding a worn air compressor pump head - Restoring compression on a workshop piston compressor - Service stock for maintenance engineers and compressor repairers - Replacing rings during a piston and cylinder inspection In the box: One ring set in the diameter and ring count you select. Note: Isolate the compressor from power and release all stored air from the tank and pump before stripping the head. Measure the piston diameter before choosing a size, as the sets are sold by diameter and ring count.