Nut and Insert Compression fittings 1/4″. All of Shoo-fly connections are compression fittings. Anytime you are moving or repairing tubing you will need to replace the Nut and Insert. Please see the Manual for instructions on proper installation of the Compression Fittings. We also have 3/8″ nuts and inserts. Call Shoo-fly at 352-351-5858 to order any parts that you do not see on our site.