Air source treatment units includes filters, regulators, filter regulators, and lubricators, or their combined dyad or triplet. It confirms to standard modular design and can be freely separated and combined. The product has reasonable design and easy to adjust. It can meet all requirements of pneumatic system. Specifications: 1) Joint diameter: 1/8", 1/4", 3/8" 2) Operation pressure: 0 ~ 250psi 3) Metal couple