With all the talk recently about low head ponds that use airlifts and/or axial flow pumps I figured it was time to release large diameter pipe TPR's. GPR's or Flanged Fittings have been around for a while in large diameter, but these are very heavy duty so you don't have to worry about them breaking during installation. Both of these returns are sch 80 pipe nipple connections so you will need to provide a slip connector to attach your plumbing lines.

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