The best replacement for diaphragm is cervical cap.

The best alternatives to diaphragm are rated as following:
★★★★★  cervical cap
★★★★  bell
★★  sponge
★★  iud
★★  condom
★  cap
★  piston sprayer
★  piston regulators
★  piston pump
★  femcap
★  bell of stethoscope
  piston regulator
  piston
  bladder tank
  female condom
  condenser microscope
  piston airless sprayer
  copper iud
  diaphragm
  membrane caustic
  peristaltic pump
  pessary
  cervical cup
  piston backpack sprayer

Your alternative for diaphragm is not listed? Suggest!
Speaking about diaphragm, one probably shouldn't forget about spermicide.

Other search terms related to diaphragm and their ratings are:
★★★★★ spermicide
★★★ spermicide effectiveness
★★ breathing
★★ spermicidal jelly
and without spermicide
inspiration
spermicide how to use
You have in mind a companion for diaphragm and it is not yet here? Propose!



Google Trends

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diaphragm
cervical cap
bell