High performance sewer system
Highway trench drain
Home water conserver
Hydraulic transportation system
Hyenol pits
Improved bidirectional gasket having water energizing pockets
Improvements relating to septic tanks
Infiltration block
Inlet filter
Instant water seal trap for existing drainage systems
Interface unit for vacuum sewers
Isolation baffle assembly with imbedded removal filament and...
Joint assembly for vertically aligned sectionalized manhole...
Junction and connection terminal for the service of fixed or...
Kerb and drainage installation and method and apparatus for...
Latch for leaching chamber
Laying structure for vacuum sewer pipe of vacuum sewage...
Leveling mechanism for floor drain
Lining of sewers and the like
Liquid drainage system for a hard-top surface