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Just bump the slide switch the opposite direction to relieve most of the pressure. The cap like mentioned is a metal on metal seal. It won't hurt to leave the T on if tightening the cap stops the leak. Just back up the fitting with another wrench so you don't exert the full force of tightening up the cap onto the fitting. The part of the fitting that screws into the cylinder is a straight thread o-ring fitting. Just hand screw the fitting down snug clocked in the desired direction and use a wrench to tighten the lock nut to compress the o-ring. Don't use any sealer as they are meant to seal via the o-ring. These hydraulic systems are "self bleeding" meaning just cycle your slides all the way in and all the way out 4-5 times and you're done.
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