UNLOADER, VB10 Pacific Bay Equipment Sale! from $239.00 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. UNLOADER VALVE - VB9 TRAPPED PRESSURE SERIES PSI: 3600 Rated PSI: 3200 GPM: 8.0 Instant Pressure Response Hex-Shaped Non-stick Check Valve 3/8" FPT Inlet, Outlet, Bypass Brass Valve Body / Stainless Ball and Seat Knob Included VB9 - Panel Mountable Reduces trapped pressure to 25% of operating pressure when unloading; allows easier gun trigger pull VB10 with Knob - YU3678