I've used a fair few of the orange bulkhead whatnots from Speidel (via Vigo) but have encountered a fair few failures where the inner part has snapped below the thread. I just now noticed another had broken.. obviously it poses quite a risk of air getting in to cider batches and the whole thing is frustrating because they're not exactly cheap when you factor in VAT and postage.
Has anyone else encountered this? I don't think I'm doing anything obviously wrong with them...
Alongside, has anyone got any suggestions of similars for using the large bubblers? I got a few black ones quite recently from some UK source (must dig to find out where..) but those don't come with screw on caps which can be useful at times.