This is the same dude who doesn’t know what kind of driveway surface he has and didn’t want to get a jack rained on. Always comes up with the unrealistic questions and won’t answer back
Looks like a flat face o-ring type fitting. If that’s the case no amount of tightening will stop leak. O-ring needs to be replaced. Mess is likely no matter what. That’s why they make pressure washers. Even if it is a JIC fitting to properly tighten the lower hose needs to be removed for access...
Do you work in the power industry? Standard hardware on heavy equipment till it went metric still is 5/8” bolts are 15/16” tools and 3/4” are 1 1/8”. 7/8” are 1 5/16” and 1” fasteners are 1 1/2”. This whole thread has been derailed by suggestions for larger size tools. Believe me I have been...