After a lifetime working in the PVC manufacturing and chemical business and years doing service and warranty work with PVC roofing contractors throughout the US, this poor guy ended up with us. The “Knipper” might be small in stature but he is a giant for our company, “Knipper” knows so much about PVC he’s like a walking encyclopedia. Mark works on dealer sales, dealer training, product R&D, and the endless reams of QC related projects for Tuff.