The NANPU Piggyback Compressed Air Filter-Regulator Assembly incorporates a high-grade 5-micron brass filter cartridge, a robust polycarbonate sump, and a user-friendly semi-automatic drain system. Affixed to a rigid metal mounting bracket and furnished with a precise 0-150 psi pressure indicator, this integrated module delivers efficient air purification and exact pressure modulation, rendering it a superior solution for varied industrial compressed air implementations.