13/16" Top Distributor .010 - .013 Glue type Screen. Used on many Autotrol Valves before the Twist On Valve design.
While PVC cement can be used to assemble the part to the Valve, the manufacturer recommends using MEK ( Methyl Ethyl Ketone ), sometimes called Butanone, which can be usually be found near the Turpentine section of large hardware stores.