Automatic liquid-flow control machines and instruments for fluid handling, namely, grippers, connectors, cone fittings, inverted cone fittings, O-ring fittings, O-rings, couplings, cap adaptors, ferrules for fluid flow control, injection valves, rotary valves, check valves, non-return valves, barbed check valves; chromatography columns; [ electronic controllers for use with electric rotary valves; ] manual control valves for regulating the flow of fluids and gases; [ electric valves for controlling gas or liquids; ] pressure relief valves for controlling flow of fluids and gases; [ automatic valves, namely, isolation valves, mixing valves, pinch valves and check valves, all for use with scientific and laboratory apparatus; ] laboratory and scientific apparatus, namely, manifolds for fluid handling systems; scientific instruments for measurement, namely, reservoirs for chemicals, vapors and solvents; laboratory filters for use in chromatography columns; laboratory equipment, namely, tubes for transporting fluids and gases for scientific purposes and silicone seals for use in laboratory fluid handling systems; and parts and fittings for all the aforesaid goods; jackets for chromatography columns and connecting sleeves; bubble traps for laboratory use for use in fluid handling systems