This appraisal considers devices to prevent ants from filling underground spring hydrant wells with soil.
Hydraguard is a circular plate with an elastomeric seal located around its rim. The plate has 4 bolt holes and two drainage plugs incorporated into the plate. The Hydraguard is installed between the flanges of a hydrant and riser during installation.
Retroguard is a complementary product to Hydraguard that allows for a retrofit installation on existing hydrant assemblies. Retroguard is an elastomeric sleeve that fits over an existing hydrant / riser flange assembly to provide a seal against the inside of the shroud pipe. It is only available for DN80 circular flanges.