Business Process Execution Language for Web Services

A liquid sampling and measuring device including a tubular casing, preferably constructed of transparent material, for holding a liquid and a valve. The tubular casing includes, at its lowermost end, a liquid conduction port for permitting liquid to flow into and from the casing. The valve, located within the casing, includes a spring biased piston provided with a port sealing member. A foot member, connected to the piston and extending through the port, operates, under pressure downwardly applied to the casing, to cause the sealant piston to retract against the bias of the spring. Cooperating cam members cause the piston to rotate and cooperating retention members on the piston and within the casing holds the piston in a retracted, open position. Pressure applied once again to the foot member causes further rotation of the piston to return the piston to an extended, closed position for sealing the port. Detachable tubular sections permit convenient storage of the device, while allowing tubular extensions for any desired depth.