The 12 inch Flared Water Pipe from Grav Labs is a great piece that is simple yet incredibly well engineered to provide awesome function. The straight tube design is complemented by an ice pinch just below the mid point so you can throw a few ice cubes in if you want to bring it down another few degrees. The fixed downstem is fitted with a multi-slit diffuser at the end to make sure that your smoke is fully broken up and given all the filtration you could want. The joint is a 14.5mm female ground glass one and the bong itself comes with a 14.5mm male bowl to fit.