McFinn's Original Filter Tubes are all individually hand blown in the USA by professional glass blowers using high quality German joints and Simex or Schott glass. Filters are for the containment of the Activated Virgin Coconut Carbon and/or Organic Cotton. The four slots on the side of the cross slots on the top of the dome were designed to allow the exact amount of (air/flow) to pass through.
Works with any glass piece using a 18mm female joint. Excellent for use with the Vaporbrothers Clear Precision Hydrator. Requires the angled 18.8mm adaptor (comes with the hydrator) when used with the Clear Precision Hydrator.
Female Joint 18mm
Male Joint 18mm
Standard Complete Length 4"