Had the same problem
It was cold when I fitted the first one and the tab broke off. I warmed the second one up to 40 degrees in the oven and still the tab broke off.
I am going to get another and I will skim a faction off the gutter.
13 Apr 2013
Fittings should be tight but these fittings were too tight and the plastic was very brittle causing the tab to break off.
6 Dec 2012
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