New Gtu Shaft Packing With Graphite & Ptfe western Pacific Trading 10241 Dia. 3/16" Length 22" : Graphtex Ultra GTU packing is a unique blend of W.L. GORE fibers and graphite fibers that are impregnated with PTFE. This creates thermal conductivity which dissipates heat away from the stuffing box allowing it to run cooler and more efficiently.