Hollis replacement HP air spool
The Hollis HP Air Spool is the small sealed connector between a compatible high-pressure hose and pressure-gauge swivel. Its two O-rings seal the connection while allowing the gauge fitting to rotate as designed.
Use Hollis part 204.2310.S when matching the spool to the corresponding metal pressure-gauge assembly.
A worn or damaged spool seal can be one possible source of a leak at the gauge connection. Have a qualified technician identify the fault and match the spool dimensions and seal requirements to the exact instrument; a similar appearance does not establish interchangeability.
This is a useful workshop spare, or a trip-support spare when a qualified technician is available. Store it clean in a labelled parts container so the small spool and seals are not lost or contaminated. Installation and pressure testing should follow the instrument manufacturer’s service requirements before the gauge returns to use.


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