Here is were I got the column. I purchase a lot from amazon. I could never find this locally. https://www.amazon.com/gp/product/B0026SVUFI/ref=ppx_yo_dt_b_asin_title_o04_s00?ie=UTF8&th=1
I cut it then cemented in a 4 inch PVC coupling in it with ceramic tile mastic. It is bond together OK but nothing seems to stick very well to the composite material.
