I bought mine from ebay (6 pint not 4) from the USA and had it shipped, then got all the connections and had it fitted by JS Racing, the Accusump even from the USA was that kind of price the fittings were quite expensive as you need non return vavles and filters etc.
Don’t forget you need the 35psi valve and fitting kit like this one.
US or English Pints 
Well they are measured in quarts so US I suspect, which as we all know is the wrong amount 
Does your car run on Trophy Bitter then ‘the pint that thinks it’s a quart’? 