Replacement Oil Filter, Series ROTARY COMPRESSOR, Compatible with Grainger Part Number 1NPK9, 1NPL1, 1NPL2, 1NPL3, 1NPL4, 1NPL5, 1ZPT2, 1ZPT3, 1ZPT4, 3HGC3, 3HGC4, 3HGC5, 3HGC6, 3HGC7, 3HGC8, 3HGC9, 3HGD1, 3HGD2, 3HGD3, 3HGD4, 3HGD5, 3UB84, 3UB85,...