Brass Connector,1/4"NPT Male x 1/4"NPT Female Pipe Dual Head Hose Connector - 1.57 x 0.79 x 0.94"(L*W*H)
$10.99
Connector Type : 1/4" NPT Male x 1/4" NPT Female When you are not using the airbrush/gun/tool, you can turn the knob and divert the air out the bottom hole.