3-Way Brass T-Fitting with 2-1/4" Hose Barbs for Vacuum Gauge
Tee Fitting with 2 Hose Barbs.
The VA-3525 tee fitting allows you to mount your liquid-filled gauge at any convenient location on your vacuum hose.
Just cut your line where you want it.
Screw the gauge into the tee, and just push the hose ends over the nipples.