K3.0 UNLOADER 1/2" 2.10-2.90 Pacific Bay Equipment Sale! from $172.00 Qty. Add to Cart This item is currently on backorder but you can still purchase it now and we'll ship as soon as more become available. Unloaders relieve line pressure in bypass mode. Temp: 165°F 3/8" FPT Inlet ZK3: 1500 PSI