This double pack consists of two hardline fittings for hard tubes from Bitspower Touchaqua . The black connectors serve as connectors between an acrylic tube with a 16 mm outer diameter and a G1 / 4 inch connector . The fittings and the union nuts are made of brass, high-quality rubber rings provide the necessary sealing.Technical details:- Material: brass- Colour: BlackConnections:- 1x 16 mm hard tube- 1x G1 / 4 external threadContents:- 2x Bitspower Touchaqua connection G1 / 4 inch AG on 16mm AD hardtube in black