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they are a practical choice for surveying
This 4" collar fits on the outside of PVC
it installs in gravity-flow systems using flexible couplers and can be operated at varying depths with an extension handle (sold separately)
Economical slide valve for reliable water flow control in drainage systems
4" Steel Grate | Agri Drain they are a practical choiceHeavy steel drainage grate designed to protect drainage intakes and improve water flow. This low profile 4" grate fits on the outside of PVC, Corrugated Metal Pipe (CMP), or Corrugated HDPE Drainage Pipe and is oversized to accommodate varying pipe ODs.
US$ 67.99
US$ 34.99
US$ 67.99
