This 90° fitting with 3/8 hose, 1/4" NPT is used in most threaded ports of the flight instruments and is a FAA PMA direct replacement for the Airborne model 1K1-4-6.
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Please note, Aircraft Spruce Australia's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Aircraft Spruce Australia assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.
The fittings should self-seal as they are NPT threads. If you insist on using something you can use a dry silicone spray, but you must make sure it completely dries before installing the fitting.
Teflon tape is NOT recommended on any part of the pneumatic system as it can get sucked into the system and ruin the pump or instruments.