Im not sure such a bend is made at that angle for rainwater. Although probably not the most aesthetically pleasing option, you could use a 112.5 deg junction, put a 112.5 deg bend into the branch to return to the vertical plane, then use a 92.5 deg bend to pick up your horizontal connection.
No. You just need to put an offset (facing up) into the 'Y' part which will then give you a parallel vertical. Then you need a 92deg which goes into the offset and so gives you your horizontal.
Phone call (hopefully!)=work. Rather hoping I get a call like that before the end of the day!....
Just done a quick Google, I usually use Polypipe stuff, I know they dont do a 90ish junction, Marley do a 20deg bend but dont think that'll help. Think our suggested solution is the only answer really.
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