richc
Regular.
I found these that look to me like the tank connectors a lot of people use on mash tuns, boilers etc but with the hard work already done for you. At 11 quid for a pair they are a bit more expensive than the tank connectors but would save quite a lot of work.
http://cgi.ebay.co.uk/15mm-Watertight-B ... 1253wt_964
http://cgi.ebay.co.uk/15mm-Watertight-B ... 1253wt_964