18" Steel Hinged Heavy Duty Flap Gate for PVC, CMP | Agri Drain This 12" collar fits on

This 12" collar fits on the outside of PVC or Corrugated Metal Pipe (CMP) and holds the grate flush inside the collar

This 6" Valterra valve attaches to SCH40 PVC pipe and offers unrestricted flow

This 18" version fits on the outside of Corrugated HDPE Drainage Pipe and is intended for heavier-duty surface conditions

Zinc dichromate-plated steel resists corrosion and installs inside 24" I

18" Steel Hinged Heavy Duty Flap Gate for PVC, CMP | Agri Drain This 12" collar fits onHelp keep damaging water out of drainage systems with this 18" heavy duty hinged flap gate. It fits outlet ODs from 18. 25" to 20" and is built for durable outlet protection on PVC and Corrugated Metal Pipe (CMP).