360rotation, more convenient and quick to move underwater without being obstructed by water pipes.Generic thread, you can choose this adapter according to the diameter of water pipe and breathing valve.Used to connect the Pressure Relief Valve and Medium Pressure Tube, which can be rotated to facilitate flexible underwater activities.Quick connection and quick unloading, convenient and quick. he threaded interface is universal in the world, Used to connect the Pressure Relief Valve and Medium Pressure Tube.Size: 5.5x2.5cm/2.17x0.98inchInterface size(Inner ring diameter):Pressure Relief Valve interface: 1.55cm/0.61inchMedium Pressure Tube interface: 1cm/0.39inchWeight: 27gRotation angle: 360[Conversion: 1cm=0.3937 inch, 1inch=2.54 cm]Material:Aviation aluminumcolour:Black Package Contents:1 x 360 Swivel Regulator Adapte Only the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.