Pneumatic Couplers and Bodwen Collets fail easily with normal use, creating the undesired effect of allowing the bowden tube to move, which can cause printing issues. Compression fittings are an all metal solution to this problem and will ensure a very secure connection. To install on a STOCK Bowden Hotend (ALL Metal Hotends can disregard steps 3 and 11)1) Removed Bowden Tube from Pneumatic Coupler 2) Remove Pneumatic Coupler from the Hotend Heatsink 3) Back off the nozzle from the heatblock by 90° 4) Screw in the Compression Fitting to the hotend Heatsink hand tight5) Slide the Compression Nut over the bowden Tube 6) Slide the Ferrule over the bowden tube 7) Push the bowden tube into the hotend until it butts up directly on the nozzle 8) Keeping downward pressure on the bowden tube, screw down the Compression Nut over the Ferrule onto the Fitting until hand tight 9) Once hand tight, use a wrench and add an additional 90° of rotation to the Compression Nut 10) Give the bowden tube a tug. It should be snug. If the Bowden tube moves, push the bowden tube down and add an additional 45° of rotation and check again. 11) Once the Bowden Tube is secure, torque down your nozzle back onto the bowden tube (>3Nm) to ensure a gap-free fit. *Note - Over torquing the nut can squeeze the ferrule too tight and kink the bowden tube, thus making it harder for the filament to pass through. When applied correctly the Bowden tube will not move and filament will pass easily through.*The Process for the Extruder is the same as the hotend , minus the need to account for a nozzle