Air Compressor Ring Set Use with DPA-4371 Piston STD 5 Rings Rings for 2 Pistons Tu-Flo 501 Compressor Application Part number: DRS-4311-STD OE MFG: BENCHMARK TECHNOLOGY GROUP OEM Reference: 286183 Cross Reference: MACK : 745-246425, 745-286183; OTHER : 286183, B-0108-STD, P0108-000 | PAI : 4310-STD Product Class: Air Compressors & Parts The PAI DRS-4311-STD is an air compressor ring set described for use with the DPA-4371 standard piston and Tu-Flo 501 compressor application. Air compressor rings are heavy duty diesel truck parts that seal the piston within the compressor cylinder as the compressor builds air pressure. This set is described with five rings for two pistons, while Benchmark Technology Group lists OEM reference 286183; Mack cross-references are 745-246425 and 745-286183.