Termite barrier seal

1. A termite barrier seal including:

a) a hollow seal body having a wall surrounding an axial bore extending from an insertion end to an orifice at a surface end, the bore terminating at a blind end at or near the insertion end to form a membrane including an inverted dome portion which may be opened by movement from a sealing position to an open position by relative resilient deflection towards the insertion end from the surface end by an external face of an injector when inserted into the bore of the seal body and arranged to permit liquid flow through the axial bore from the surface end to the insertion end, but to prevent liquid flow through the axial bore from the insertion end to the surface end when the injector is inserted into the bore of the seal body;

b) a closure formation about the surface end for engagement with a closure;

the closure for closing the orifice of the bore at the surface end of the seal body when engaged with the closure formation;

c) at least one resilient external seal means about an external surface of the wall of the seal body for sealing the wall of the seal body against an internal surface of a hole drilled through a concrete slab;

d) a bulbous resilient engagement portion extending radially inwardly from the wall into the axial bore and depending axially from the dome portion towards the surface end and sized for engaging with the external face of an injector when inserted into the bore of the seal body, to provide an interference fit with the external face of an injector when the injector is inserted into the bore, and

e) an enlarged bulbous hip portion extending radially outwardly from the external surface of the wall of the seal body concentrically outside the resilient engagement portion.

2. The termite barrier seal according to claim 1 , wherein the resilient engagement portion is provided by a radially inwardly projecting annular member.

3. The termite barrier seal according to claim 2 , wherein the radially inwardly projecting annular member is defined between a substantially planar circular inner surface of a plenum in the axial bore and the inverted dome portion of the axial bore, providing a seal against liquid passing through from the insertion end to the surface end.

4. A termite barrier seal including:

a) a hollow seal body having a wall surrounding an axial bore extending from an insertion end to an orifice at a surface end, the bore terminating at a blind end at or near the insertion end to form a membrane including an inverted dome portion which may be opened by movement from a sealing position to an open position by relative resilient deflection towards the insertion end from the surface end by an external face of an injector when inserted into the bore of the seal body and arranged to permit liquid flow through the axial bore from the surface end to the insertion end, but to prevent liquid flow through the axial bore from the insertion end to the surface end when the injector is inserted into the bore of the seal body;

b) at least one resilient external seal means about an external surface of the wall of the seal body for sealing the wall of the seal body against an internal surface of a hole drilled through a concrete slab;

c) a bulbous resilient engagement portion extending radially inwardly from the wall into the axial bore and depending axially from the dome portion towards the surface end and sized for engaging with the external face of an injector when inserted into the bore of the seal body, to provide an interference fit with the external face of an injector when the injector is inserted into the bore, and

d) an enlarged bulbous hip portion extending radially outwardly from the external surface of the wall of the seal body concentrically outside the resilient engagement portion.