Smeg SUK61 Manual page 32

Connect to the appliance using a BS 669 compliant bayonet
hose. The connector, at the back of the appliance, has a 1/2"
BSP external thread. Apply insulating material to the thread of
the gas pipe connector 4 and then tighten the adapter 3 to it as
indicated in the figure. Screw the assembly to the moveable
connector 1 of the appliance, placing the seal 2 between them.
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Instructions for the installer
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