The best replacement for schedule 40 is schedule 80.

The best alternatives to schedule 40 are rated as following:
★★★★★  schedule 80
★★★★★  80
★★★★  schedule 80 pvc
★★  sdr 35
★★  80 pvc
★★  schedule 10
★★  schedule 80 pipe
★★  80 pipe
★  dwv
  schedule 20
  class 200 pvc
  schedule 10 pipe
  class 200
  sdr
  standard pipe
  pvc schedule 80

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schedule 40
schedule 80
80