Thanks. Tbh the idea of spending any real money on a gravity-defying shit-pump doesn't fill me with joy. Gonna see about demolishing the side return instead. Or maybe just a small section of it so I can pipe the poops straight down to Splinter's hideout.
Aye they are called saniflos, they work but break and are fuckin shit.
There is a pro version which is about 3 x the price that are apparently better but I’ve never fitted one!