Compression fittings work well if the pipe is clean and cut properly. Its often said in the trade to not over tighten a compression fitting, leaving you more thread in the case of a leak and not distorting the olive or fitting. Generally a nut will need one whole turn after hand tightening.Click to see full answer. Hereof, how do you stop a compression fitting from leaking?Place a little pipe thread compound around the compression ring, also known as a ferrule, and tighten the nut clockwise a little past the original position. Turn water back on and check for leaks. If the fitting continues to leak, replace the ferrule.Beside above, why do my compression fittings leak? Tighten compression fittings firmly with two wrenches to crimp the ferrule onto the pipe (Photo 3). Also make sure the pipe or tube goes straight into the fitting. Misalignment will cause a leak. If the fitting leaks after you turn on the water, try tightening the nut an additional one-quarter turn. Similarly, you may ask, are Compression Fittings reliable? Although compression fittings are generally considered more reliable than threaded fittings, there are some potential problems. In general, compression fittings are not as resistant to vibration as soldered or welded fittings. Repeated bending may cause the ferrule to lose its grip on the tube.What is the most common cause of leaking compression fittings?Over tightening is the most common cause of a leaking compression fitting.