There is a piece of light grey plastic tube with a female wide screw fitting at one end and a clean cut off at the other, it's a single piece item. The item is 10.75"/27.5cm long. The tube section of the item has an internal diameter of .75"/1.9cm The wall of the tube is roughly 2mm thick The screw end has an internal diameter of 1.25"/3.5cm
The only markings I can find on the tube are: 8 718 006 883 Lf.-Nr.062 304
The boiler itself is a Worcester-Bosch Greenstar 40 HE Plus Condensing Combi
I've searched through the manuals and found no mention of the tube, I've offered the threaded end up to all the connectors on the boiler, I've searched online for the numbers I've entered above and I have (of course) searched through this newsgroup trying to find answers.
Can anyone help me identify this part?