The best replacement for sch 40 is sch 80.

The best alternatives to sch 40 are rated as following:
★★★★★  sch 80
★★★★  sch 80 pipe
★★★  dwv
★★  sch 40s
★★  sch 80 pvc
★★  sdr 35
★★  sch 20
★★  80 pvc
★  sch 10
  pvc sch 80
  sdr 21

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sch 40
sch 80
sch 80 pipe