The Dunlops are chinese knock offs, yes and utter crap!
The Dunlop pumps are chinese knock offs, the Bags and dryer are Dunlop OE however the OEM compressor is an adaption of the Thomas 315 compressor from the States,.
I made the mistake of fitting a Dunlop one to mine and it lasted 2 months!!
So did you send it back for replacement under its 12 month warranty??
Looks nice and shiny doesn't it!!
2 months later!!
£200 mistake, that YOU shouldn't make!! It even sounded like a skeleton wánking in a biscuit tin when it was new!!
My old compressor is/was in a million pieces so I bought a rebuilt OE unit from ebay from a chap called
http://myworld.ebay.co.uk/original_landyair/
You can even send him your old one and he'll completely rebuild it..
He even sells the refurb kits..
X8R are the only ones that should be used to be fair.