To start using Sodastream cylinder, turn adapter's top valve fully anti-clockwise, attach adapter to the cylinder with your hand making sure it is completely tight. Next tighten regulator to adapter with spanner or wrench. Last step is to release top adapter's valve by turning it clockwise till you get readings on both regulator's gauges.

Fits all our regulators

Enjoy...no leaks, no gas bursts, plug and play.