howabout something like this - https://www.ebay.co.uk/itm/40396003...uid=HKK-PVH6Qm2&widget_ver=artemis&media=COPY
I used JCB non return valves (LINK) as I didn't want to trust the cheap chinese non name ones. they are probabaly all from the same place but at least JCB should be built to a similar durabilty to a land rover.That will do the job as it has the T pices and Y piece connectors and the black pipe. All you need to add is a non return valve which is a couple of pounds. See this for the cheapo non ret valve
https://www.ebay.co.uk/itm/283240045625
the outlets with twin jets in each
https://www.ebay.co.uk/itm/144236421317
pipe
https://www.ebay.co.uk/itm/144256082233
https://www.ebay.co.uk/itm/393833652465
T pieces etc
https://www.ebay.co.uk/sch/i.html?_...13&_nkw=T+JOINER+Piece+3+WAY+PLASTIC&_sacat=0
good luck with it all.