I’m thinking of this kind of pump http://www. machinemart. co. uk/shop/produc…
Aside from a non return valve, is there anything else I need to place on the tap?
I want increased water pressure, but not to the extent of a pressure washer.
Thanks

well here is the situation, I have two 3000PSI pressure washer pumps, and gas engine, and if I was connected to the engine, which provides a sufficient flow of water and use the COUPLER is the output of both, I am responsible 6000psi water pressure or I eventually make pressure and possibly hurt the pums, or dying process.
I hope that someone with a degree in engeniering reads this, maybe I can get a valid answer. oh and sorry my spelling disaster here. . . . He he he

I need a female to female adapter to adapt to the pressure washer thread that does not appear to be a standard metric thread.