Compression fittings are so defined because the tube closing on the fitting is made by a cutting compression ogive which holds on the tube. Compression fittings are suitable for the assembly of rigid tubes (copper, brass,…); for possible use of “plastic” tubes a special stiffener (cod. D414) is necessary to be inserted in the tube until the suitable support.
All fittings belonging to this category have been planned according to DIN rules which control the product.