17-02-2013, 06:52 PM
it depends on the size of the hole and what size tapping set youve got! i honestly wouldnt bother with one of the barb ones. Just get the one with bolts through and has a seal on both size! I bought a barb one and couldnt get a tapping set big enough so i bought one of these in the end!
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?V...1044645661
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?V...1044645661