The 3DXL is the largest chamber Puffco makes for the Peak Pro — a bigger ceramic bowl than the standard 3D, so it holds more and goes longer between refills. Heating tracers run through the bowl walls rather than only the base, which is what keeps the draw even from the first pull to the last.
Drops straight into any Peak Pro, no tools. Needs the Puffco app and current firmware.
Genuine Puffco part, in black, on the shelf in Santa Barbara.