The best replacement for spacer is nebulizer.

The best alternatives to spacer are rated as following:
★★★★★  nebulizer
★★★★★  holding chamber
★★  shim
★★  colonist mass effect
★★  nebuliser
★★  open spacer
★★  washer
★  super spacer
★  chamber
★  coil spacer
★  standoff
★  crush sleeve
★  four hole spacer
★  throttle body
  plenum
  4 hole spacer
  intercept
  tire glass beads large hole
  earthborn
  open carb spacer
  valved holding chamber
  mdi
  no spacer
  intercept spacer
  wheel adapter
  cold air intake

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

Other search terms related to spacer and their ratings are:
★★★★★ inhaler
★★★★ mdi
★★ symbicort
★★ combivent respimat
★★ an inhaler
★★ flovent
★★ dulera
★★ metered dose inhaler
★ mask for inhaler
★ advair
★ qvar
★ albuterol
★ advair hfa
ventolin
spiriva
You have in mind a companion for spacer and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of spacer in all years. Click on graph for more.
spacer
nebulizer
holding chamber