yes, all you need is the smallest one. you can get the next step up which has a control on it to vary the flow which is even better than having to hookup thumb valves inline in the hoses. The more they cost the quieter they are too
You can use the air pump to pressurize a 750-1,000 mL water bottle that is filled with ice water, piss, cola, T, whatever, and a second hose wedged into the cap as well. The other end of the second one wedges into the tip of your pisshole. Close a thumb valve slowly until the contents start moving into your pisshole and relax your cum and piss muscles letting your juice invade your bladder. Swap it with your friend also sharing that hose or.....