I have a Hoselock reel. Somehow a side adapter has gone missing. I don't know what it's called. See pic below: Do I need one of these?: I went into B&Q. All of the adapters attached to the same reel type I have where grey? Rather than buy the above item - which costs about £4, I can get a pack of 4 attachments for the same price or less, one of which looks like this part. (Might not be hoselock make, but it's just a bit of plastic right?) I'm hoping someone can tell me what the part is I need. Thanks.