3M 2131 Resin For Splicing Kits Latch Catch The Assist Salt’s bright yellow Two custom audible and The Assist Salt’s bright yellow handle is injection molded from tough fiberglass reinforced nylon and has both a Bi Directional Texture™ pattern and finger grooves to guarantee a secure grip Other differences include: 1) The main exhaust body of the KMB 28 is part of the frame itself and uses a #545 041 main exhaust cover 2) no comfort insert is required on the “28” 3) the face ports for the 18 and the 28 differ slightly in size Buy extra resin to use with the reusable molds that come in the 3M splicing kits The 3M 2131 resign is used in to mold connectors together