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IDEX Health & Science Large Bore Flangeless Fittings eliminate the need to flange tubing. This removable and reusable system provides several benefits. Flangeless Fittings are easy to use. Just slip the nut and ferrule over the tubing and finger tighten the assembly into your receiving port. Our Large Bore Flangeless Fittings are specifically designed to work with 5/16-24 & ½-20 threaded fittings. Flangeless Fitting require minimal downtime because component replacement is quick, taking only a few seconds. Flangeless Fittings system typically requires only one new ferrule at minimal cost when repairing a connection.