I have this and have converted it into a gravity feed water filter. (I dont get the feeling it will last a year backpacking 5 long trails)
I removed the shower rose and fitted a sawyer quick disconnect coupling - the other end I fitted to a Sawyer Mini filter and then to a 1m hose to create suction.
My next task is to glue the shower rose to the other side of the Quick disconnect so I can change it between shower and water filter.
Anything vehicle based I think the cheap plastic ones will last longer.
That said, I am planning on converting a Cheap 8L dry bag (Maxed brand) with an inner tube nozzle to make my own for 1/2 the price