Acu-Tech sells a range of standard size Blind Flanges. Blind flanges are used to cover or close the end of a HDPE pipeline, using backing rings and bolts to hold it to the end of the HDPE pipe. Also known as Blind Pipe Flange, or Solid Flange, a Blind Flange has mounting holes around the perimeter, and prevents fluids from passing through the pipe.
Blind Flanges come in a Galvanised finish or in Stainless Steel, to suit Poly Pipe from 15mm to 800mm.
For your convenience, Acu-Tech also sells Bolt Sets, Gaskets and Backing Rings to suit Blind Flanges. See https://www.acu-tech.com.au/ancillary-items/