Do NOT attach the H2 Fill Adapter to the Probe Port! This will lead to a costly repair.

No_H2_in_Probe_PortTo avoid this scenario, follow these precautions:

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Keep a Probe connected to the device at all times. Keep the H2 Fill Cap in place at all times
(Except, of course, when you’re filling the phx21 with Hydrogen).

For information on the proper use of your phx21, please refer to the phx21 User Manual.

You can download a copy of the phx21 User Manual from our website or request a physical copy by sending an email to or calling 1-877-788-1110 x6.

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