Packer System Liner Hanger System Cementing Equipment Casing Clean-Up Tools Flow Control Equipment Centralizer & Stop Collar Float Equipment Specification Sheet (WC-Packer-T&A) NON PERFORATED PRODUCTION TUBE WC-NPPT / WC-22801 The Non-Perforated Production Tube is made-up at the bottom of the production string. Its basic purpose is to act as a stinger (or extension) to keep the packer flapper valve open when producing or when working below the packer.