Packing construction

Claim 1

A COMPOSITE PACKING COMPRISING A DEFORMABLE SUBSTANTIALLY NONCOMPRESSIBLE ELONGATED PACKING MEMBER HAVING IN TRANSVERSE CROSS-SECTION A BASE OF WIDTH W FROM WHICH EXTENDS A BIFURCATED PORTION DEFINED BY SPACED APART LEGS FORMING A GROOVE FOR RECEIVING AN O-SHAPED MEMBER, THE SURFACES OF SAID LEGS ADJACENT THE EDGES OF SAID GROOVE BEING FORMED TO FLARE OUTWARDLY FROM A TANGENTIAL INTERSECTION WITH THE INNER SURFACES OF SAID LEGS, A DEFORMABLE SUBSTANTIALLY NONCOMPRESSIBLE O-SHAPED MEMBER OF DUROMETER LESS THAN SAID PACKING MEMBER SNAP SEATED IN SAID GROOVE IN SURFACE CONTACT WITH THE INNER SURFACES OF SAID LEGS AND NORMALLY HOLDING SAID BIFURCATED PORTION SPREAD TO A WIDTH GREATER THAN W, SAID O-SHAPED MEMBER HAVING A DIAMETER EXCEEDING THE LENGTH OF SAID LEGS WHEREBY A PORTION OF AID O-SHAPED MEMBER EXTENDS FROM SAID GROOVE, THE FLARED EDGES OF SAID GROOVE DEFINING WITH THE ADJACENT SURFACE OF SAID O-SHAPED MEMBER, RELIEF AREAS, WHEREBY WHEN SAID LEGS ARE CONSTRAINED TO AN UNSPREAD CONFIGURATION AND SAID O-SHAPED MEMBER IS DIAMETRICALLY COMPRESSED TO A DIMENSION APPROACHING THE LENGTH OF SAID LEGS, A PORTION OF SAID O-SHAPED MEMBER IS DISPLACED INTO SAID RELIEF AREAS, SAID RELIEF AREAS BEING SUBSTANTIALLY EQUAL TO THE AREA OF THE DISPLACED PORTION OF SAID O-SHAPED MEMBER.