double barrel back

Excellent!

That's an idea Homebird.....I could have a couple on my greenhouse!

yes, I have four, Homebird, and plan for more - I want to get small guttering on the sheds and conserve that rain water too. Actually, I'd like to get some plastic and "roof" the space between the sheds, partly to give me an outdoor dry space and partly so i'd only need one lot of guttering and one butt for all of it.

I'm not sure how to put guttering on a platic fabric greenouse, but maybe something can be worked out!