Combi boiler questions: what are these plastic pipes for?

Soldato
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Hi boys and girls.

Had a minor drip coming out of my Worchester boiler so called out the plumbers. They 'fixed' it but it was still leaking today so had a quick nose myself. I could see that a plastic pipe that is simply slid on to a metal pipe had slipped off, so I've pushed it back on and the leak has stopped. Here's a picture:

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This plastic pipe runs down and is joined by another with an odd looking clear plastic valve, then runs under the floor.

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So two questions, should there be water in that pipe, and what's that clear valve thing for?

Trying to get the plumber back out without charge, as obviously I'm not a gas safe engineer!
 
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