Just got these in the mail. Thought I would give them a test drive and glad I did. I'm one of those airgunners who likes to leave the fill probe attached to the end of the fill whip. This cover fits over the probe and quick disconnect perfectly.
https://airtanksplus.com/product/female-quick-connect-dust-cap/
Peace and dust cap grease
Fuss
https://airtanksplus.com/product/female-quick-connect-dust-cap/
Peace and dust cap grease
Fuss