Custom-designed vessels, including suction line accumulators, mixing chambers, and fuel injection testers, can be manufactured with various types of circular sight glasses or level gauges for monitoring and viewing contents. Vessel design specifications such as size, materials of construction, pressure, temperature, etc. are determined by individual customer applications. Vessels are available from simple bench-scale to more complex systems. Accessories include heaters, pressure and temperature gauges, valves, instrumentation, wheels/carts, pumps, etc.; choice of connection includes NPT, flange, sanitary, and more. Vessels made of stainless steel, carbon steel, or exotic alloys are available, and have been manufactured for various industries, research facilities, laboratories, government, and universities.