The best replacement for siphon is syphon.

The best alternatives to siphon are rated as following:
★★★★★  syphon
★★★★  gravity feed airbrush
★★★  gravity feed
★★★  gravity airbrush
★★★  pressure sandblaster
★★★  french press
★★  gravity feed spray gun
★★  pour over
★  gravity fed airbrush
★  gravity hvlp
★  flapper
★  pressure sandblasting
★  gravity paint sprayer
★  chemex
★  pressure feed
★  hvlp
★  death pact
★  sodastream
★  conversion
★  gravity gun
  aeropress
  moka pot
  soda maker
  racking cane
  washdown
  gravity spray gun

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Speaking about siphon, one probably shouldn't forget about racking cane.

Other search terms related to siphon and their ratings are:
★★★★★ racking cane
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siphon
syphon
gravity feed airbrush