This is smaller than the one on the strimmer.
I did have a problem ordering as my strimmer is a "Wickes product with the same model number"
I tried to find one on the ALM site but unsucessful for Wickes although there seem to be several
possibilities possibles but I didn't have time to Telepone and check at that time so bought this one
but the cap is a different size.
My fault for not persuing the matter 6 weeks or more ago!