Threaded pipe connection

Claim 1

A FLUID COUPLER COMPRISING A MEMBER HAVING A PASSAGE EXTENDING THERETHROUGH AND FIRST AND SECOND EXTERNAL CYLINDRICAL PORTIONS EXTENDING ON A COMMON CENTRAL AXIS ABOUT THE PASSAGE, THE FIRST CYLINDRICAL PORTION BEING DISPOSED AT ONE END OF THE MEMBER AND HAVING OUTWARDLY EXTENDING THREADS THEREON ADAPTED TO MATE WITH THE THREADS OF A FEMALE MEMBER, SAID MEMBER HAVING AN INTEGRAL OUTWARDLY EXTENDING PORTION WITH A FLAT SURFACE CONFRONTING AND NORMAL TO THE AXIS OF THE SECOND CYLINDRICAL PORTION, THE SECOND CYLINDRICAL PORTION EXTENDING FROM THE FLAT SURFACE AXIALLY A DISTANCE GREATER THAN ONE PITCH WIDTH AND HAVING A DIAMETER LESS THAN THE DIAMETER OF THE ROOTS OF THE THREADS ON THE FIRST CYLINDRICAL PORTION OF SAID MEMBER, THE SECOND CYLINDRICAL PORTION BEING SPACED FROM THE SURFACE OF THE ROOTS OF THE THREADS BY A DISTANCE NO GREATER THAN THE HEIGHT OF THE THREADS, SAID MEMBER HAVING AN OUTWARDLY FACING ANNULAR GROOVE IN THE FLAT SURFACE WITH AN INNER DIAMETER APPROXIMATELY EQUAL TO THE DIAMETER OF THE SECOND CYLINDRICAL PORTION AND AN OUTER DIAMETER GREATER THAN THE INNER DIAMETER BY A DISTANCE BETWEEN ONE AND THREE TIMES THE HEIGHT OF THE THREADS, SAID GROOVE BEING SO LOCATED IN SAID FLAT SURFACE THAT THE INNER DIAMETER PORTION FORMS A SMOOTH CONTINUATION OF SAID SECOND CYLINDRICAL PORTION, AND AN ELASTOMER RING DISPOSED IN THE ANNULAR GROOVE HAVING AN INNER RADIUS SUBSTANTIALLY THE SAME AS THE CYLINDRICAL PORTION, SAID RING HAVING A THICKNESS IN THE PLANE OF THE FLAT SURFACE APPROXIMATELY EQUAL TO THE DIFFERENCE IN THE INNER AND OUTER DIAMETERS OF THE GROOVE AND EXTENDING FROM THE GROOVE A DISTANCE NO GREATER THAN ONE-HALF OF SAID THICKNESS.