If you package Cement products, Thiele's full line of valve bag packaging and sealing equipment is guaranteed to enhance your production. Valve Bagging Systems - a full line of valve bag packers and placers including 5500 Air Valve Packer - extremely accurate weighing 5521 Valve Bag Placer - handles poly or paper bags 5526 Dual Valve Bag Placer - features dual tracks for increased speeds Valve Bag Sonic Sealer - seals poly or paper bags