u/Aggravating-Dot-9367

My propane line has a leak right where the compressed fitting on the hose meets the brass. How do I fix this? Is it best to buy a whole new hose line and gauge assembly or can this be taken apart and fixed?

Just curious what the point of this pex maze is and if it is contributing to my poor water pressure? New well pump and pressure tank added. 1/2” poly throughout the house.