For use with 15mm compression fittings:elbow,coupling,tees,etc.Just simply insert this in one of the ends of 15mm compression fiitngs 
Package contains: olive,nut and insert 
Diameter: 16 mm, Female thread: 1/2", Brass
Durable, dense connection,Quick and easy assembly,Small effort,No expensive tools needed,High quality material selection 
Application: Drinking water installation, sanitary and heating installations 
 
13.1 x 5 x 2.2 cm; 41 Grams