LISLE Master Line Stopper Set LS67000 The Master Line Stopper Set provides coverage for many internal and external lines found on vehicles. Four different size stoppers for automotive flare type steel brake lines, power steering and transmission cooler lines. . Includes four stoppers to seal lines in automotive flare type steel brake lines, power steering and transmission cooler lines. Two line clamp pliers 6-1/4" and 7-1/4" in length seal flexible brake lines, fuel and vacuum lines, with smooth rounded edges that will not damage internal hose reinforcement. Made of light weight and highly visible, fluid resistant nylon reinforced plastic. Eight stoppers and four caps are made of highly visible, flexible plastic and used for plugging vacuum and fuel lines during engine tune-ups. Stepped design can be used for both internal and external stoppage. Stopper sizes from 1/8" through 1/2". Caps are 5/8" and 3/4" for larger lines.