Looks from your picture that the pipework where the hoses are connected are too low unless I'm missing something ...can you post up a picture of one of the urinals...regards Turnpin:)
Auto syphons are available in different heights and outlet sizes I.e 11/4 x 7.....1x8 etc. Possibly to high for the system you have?.....regards Turnpin:)
TFJ find something clean to post up from that great Yorkshire comedian Charlie Williams please...you know how I'm no good at this technology lol....regards Turnpin:)
Why did the government allocate licences for fracking then if they want to break away from gas usage don't make a lot of sense really does it....regards Turnpin;)