Valpak Ultra-Flo Volute 2" | V38-130Val Pak V38 130 Ultra Flow Pump Volute (2") Black The Val Pak V38 130 is a replacement 2" volute (wet end housing) designed for select Pentair American Products Ultra Flow pool pumps. The volute is the pump housing that directs water from the impeller to the discharge outlet. Replacing a cracked or warped volute can restore proper flow, stop external leaks, and help bring the pump wet end back to original performance. Key Features Replacement volute