Hose that is chemically compatible with a particular fluid must be assembled using Fittings and adapters containing likewise compatible seals. 2.6 Permeation: Permeation (that is, seepage through the Hose) will occur from inside the Hose to outside when Hose is used with gases, liquid and gas fuels, and refrigerants (including but not limited to such materials as helium, diesel fuel, gasoline, nat