... or armor cable and protective casing.Instrumentation tubing is made in two configurations, or constructions, commonly called SquareLok and InterLok, and ... as SL and FI.The interlock hoses are mainly used in exhaust system, such as engine exhaust,vacuum and collection ... normal configuration of exhaust hose is unpacked and fully extended. In order to minimize leakage, however, exhaust hose can be ...