39 Series Air Source Treatment Unit This series air source treatment unit is in Hailong basic type, including filter, relief-pressure valve, filter relief-pressure valve, oil sprayer, or their combined dyad or triplet. It is in standard modular design and can be freely separated or combined. The product is in reasonable design and easy adjustment. Adapter caliber: G1/8"~G1" Working pressure:0.05~1.0Mpa Applicable temperature:~5~50°C