ERRL Gear - Quartz Glass Adapter Male 18.8mm > Female 18.8mm

This male-to-female adapter by ERRL Gear is made from quality quartz glass and will allow any glass water pipe to fit 18.8mm vapor domes and herb bowls.

Just place it in the joint of your bong and place your bowl or dome in it. Easy, peasy, lemon-squeezy. It fits both male and female joints so you'll never need to worry about cross-joint compatibility between your favorite smoking pieces.