hi again concept
take no notice of the guys who says this dont work
i use it and have been using it for about a year now no probs
cheap and cheerful

does the job
http://cgi.ebay.co.uk/Propump-12v-80psi-diaphragm-pump-New-Fits-TSR35-ESR18_W0QQitemZ130318118017QQcmdZViewItemQQptZUK_HomeGarden_CLV_Cleaning_CA?hash=item1e5790ac81&_trksid=p4634.c0.m14.l1262
just get a transformer works a treat
as i said a few guys on this forum have seen it working
and can back me up in what i say
