Domestic Cylinders only(26mm). Excess Flow Cutoff : Automatic shutoff gas when hose pipe is Damage/Rupture Leak and Level Indicator : Detect any gas leak before gas appliances is ignited(gas leak from pipe) and Indicate your cylinders low gas level Advance Lock Systems : Push locking gives better locking with the valve Dual Gas Sealed Technology : Facilitates leak tight connection on cylinder Domestic 5 Years Replacement Warranty . Design and Manufactured under European standards