Joint water stop

Claim 1

A WATER STOP FOR JOINTS IN POURABLE PLASTIC MATERIALS SUCH AS CONCRETE, COMPRISING A WEB STRIP HAVING FIRST AND SECOND PLANAR FACES, A PAIR OF LATERALLY SPACED ANCHOR LEGS INTEGRAL WITH SAID WEB STRIP AND PROJECTING OUTWARDLY FROM SAID FIRST SURFACE, A PAIR OF KEY LEGS INTEGRAL WITHIN SAID WEB STRIP AND PROJECTING OUTWARDLY FROM SAID SECOND SURFACE IN SUBSTANTIAL ALIGNMENT WITH SAID ANCHOR LEGS, SAID WATER STOP BEING ADAPTED TO BE IMBEDDED IN A FIRST POUR OF PLASTIC MATERIAL SUCH THAT THE ANCHOR LEGS, FIRST WEB FACE AND OUTER SURFACE OF SAID KEY LEGS ARE COVERED WITH SAID FIRST POUR, PROJECTING MEANS ON EACH ANCHOR LEG TO ANCHOR SAID LEGS IN SAID FIRST POUR, EACH OF SAID KEY LEGS HAVING AN OUTER SURFACE DISPOSED AT AN ANGLE OF LESS THAN 90* WITH RESPECT TO SAID SECOND WEB FACE AND AN INNER SURFACE DISPOSED AT AN ANGLE OF LESS THAN 90* WITH RESPECT TO SAID SECOND WEB FACE TO FORM A DOVETAIL KEYWAY BETWEEN SAID KEY LEGS ADAPTED TO RECEIVE A PORTION OF A SECOND POUR OF PLASTIC MATERIAL SUCH THAT A FORMED DOVETAIL OF SAID SECOND POUR MATERIAL IS DISPOSED WITHIN SAID KEYWAY, PROJECTIONS ON THE INNER SURFACE OF EACH KEY LEGS TO ANCHOR SAID INNER SURFACE TO SAID SECOND POUR MATERIAL, AND SAID OUTER SURFACE BEING SMOOTH AND FREE OF PROJECTIONS OPPOSITE SAID PROJECTIONS WHEREBY ON RELATIVE MOVEMENT OF SAID SECOND POUR AWAY FROM SAID FIRST POUR, EACH KEY LEG REMAINS DISPOSED BETWEEN SAID FIRST AND SECOND POURS WITH THE INNER SURFACE OF SAID KEY LEG ANCHORED TO SAID SECOND POUR THROUGH SAID PROJECTIONS AND WITH THE OUTER SURFACE FREE TO MOVE RELATIVE TO SAID FIRST POUR DUE TO THE ABSENCE OF PROJECTIONS ON SAID OUTER SURFACE.