Designed to Increase the Number of Outlet Ports from your Regulator 1st Stage. Simply fit to a standard 3/8th 1st Stage Outlet Port and its converted into 3 Standard Outlet Ports so you can accommodate extra hoses etc. (We have an adapter if you want to use it from a 1/2 Regulator Port). Useful if you have an older 1st Stage with fewer outlet ports. Great item enabling additional second stages / BCD Hose (say for Lift Bag / SMB etc.) to be attached to your 1st Stage. The outlet at the top of the unit swivels 360 degrees to assist you eliminating strain to your diving hoses.