Hose set for use of the v-measurement in the OLLI for the mobile gas flare S, M and L CH4. On the inlet side there is a single hose connection with S20 nipple, which is plugged into a suitable coupling in the connection area of the mobile gas flare. On the outlet side, there are two hoses with S20 couplings for concentration measurement (red hose, pressure reducer 50 mbar integrated) and for pressure measurement (black hose) in the OLLI.