Just recently got a Pittsburgh 3 ton low profile jack, the fill plug it shows in the pictures is not there, it's just a bubble do I remove that or what? :
How to Add Oil to a Hydraulic Jack: 11 Steps (with Pictures)
How to bleed a bottle jack? - Wonkee Donkee Tools
Hydraulic Jack Maintenance
How to Fill a Floor Jack - Refill a Floor Jack in 6 Easy Steps!
How to Add Oil to a Hydraulic Jack: 11 Steps (with Pictures)