This is a replacement mechanical bottom insulator for all 601 threaded SR series Hercules vaporizer cartridges. It's compatible with the Hercules SR-71, SR-74, and SR-74x. This insulator has two o-ring grooves for compatibilitywith the Nibbler XL Bubbler.
This insulator features a user adjustable pin that requires proper adjustment to make connectivity- hold one screw and turn the other 90° counter-clockwise, check and repeat if necessary until contact is made.
It's subject to wear and may require replacement if the Hercules has been repeatedly overtightened.