Ok, from what I can see there are 3 cheapish options. Option 1 http://cgi.ebay.co.uk/New-Release-D...39:1|66:2|65:15|240:1318&_trksid=p3286.c0.m14 aquahk8 Â£52.99 Option 2 http://cgi.ebay.co.uk/CO2-Regulator...photoQQcmdZViewItemQQ_trksidZp1713.m153.l1262 aquaticmagic Â£63.94 Option 3 http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&ssPageName=STRK:MEWAX:IT&item=130182583787 onlineshopstm Â£45.99 or http://cgi.ebay.co.uk/CO2-Doppelman...hZ004QQcategoryZ33077QQtcZphotoQQcmdZViewItem aquarianerversand (Lunapet) ~Â£45 (it's in Euros and there's no postage noted) + http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&ssPageName=STRK:MEWAX:IT&item=140268683476 aquarianerversand (Lunapet) Â£21.32 Total Â£67.31 So has anyone tried option 1? Is the solenoid in option 2 as bad as people say it is? Is the solenoid in option 3 as good as the blurb? Any views or opinions welcome.