The perfect bubble cap for your E Rig! Thick Borosilicate glass means it will last a lifetime. The newest version is a small, joystick style bubble cap for perfect control of your oil. Several colors to choose from and I will pick a hinge that looks good with it.
Add a Magnetic hinge for a little more and really pimp your erig out!
Also find these with a custom flexi-hinge for your particular Erig!