The best replacement for a53 is a500.

The best alternatives to a53 are rated as following:
★★★★★  a500
★★★★★  a106
★★★★★  a57
★★★  k53
★★  a513
★★  api 5l
★★  a15
★★  a105
★  a120
★  a106 pipe
★  astm a106
★  a135
★  k53 asus
★  astm a135
  a252
  x53
  astm a795
  astm a120
  a106b
  astm a500

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a53
a500
a106