Any main skoda dealer will have them or get you them, replaced 2 of mine, bit of a rip of at a tenner tho for just 2 lol

How many do you need?

I have kept mine when I removed the standard boost pipes to fit my FMIC so could sell you them?

Had a nightmare of a time trying to get some, first one the dealer gives us is huge, second was small.

Still not sure what the right part number is

Have tried 3co 145 117 and one ending in D.

Still leaks, probably worse.

I'm trying to find some reasonable aftermarket ones at the mo.

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you can try to put some ptfe tape under the seal to increase the diameter and make tighter fit. Works for me.

 

http://www.amazon.co.uk/Rolls-Water-plumbers-thread-plumbing/dp/B004CS9ZWA/ref=sr_1_1?ie=UTF8&qid=1433450519&sr=8-1&keywords=ptfe