This 18mm/18mm Ash Catcher features a matrix percolator. The Ash Catcher features a 18mm female connector on top and a 45° 18mm male connector to attach to your water pipe.
The matrix percolator is a cylinder that is located at the centre of the waterpipe base. It often has both vertical and horizontal slits, giving you the super high volumes of vapour diffusion. It helps the waterpipe produce a much smoother hit.