As Judge said mate .. It works fine, and i don't have any spare orings for it, but try o-ring monkey or the likes
But as you can see it comes with ample spares - reg, bolt, steel braided hose and a back block
As for instructions / manual it didn't come with one but there's plenty of pump and cocker enthusiasts on here - Jack_Judge, One.man.band, Hawkins etc etc and i'm sure they'd be more than happy to help.
And yes the price includes NExt day special delivery insure to £500