an interconnect device for joining disengagable portions of a closed fluid circulating system is disclosed . the interconnect device is employed at any point in the system where it may be desirable to open or disconnect the system , for example to facilitate replacement of parts in a coolant system for high density electronic equipment applications . the interconnect device , since a fluid is involved , is arranged to automatically shut off fluid flow any time the mating members are separated thereby preventing loss of fluid in the circuit .