THIS ONE WILL WORK AND IS CHEAPER matt sry did not mean to shout 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
What psi are shurlfo backpacks? Mines fantastic and will pump through 100m of microbore