High Pressure Manifold The high-pressure manifold specifically refers to the high-pressure piping system on the discharge end of the drilling pump. It is the core pressure-bearing delivery equipment in the circulating system of an oil drilling rig, receiving the high-pressure drilling fluid output from the fluid end of the drilling pump. Serving as the high-pressure fluid passage connecting the drilling pump, air chamber (pulsation dampener), safety valve, kelly hose, swivel,