SHURflo is a very common water pump. I would suggest installing a SHURflo Accumulator after the pump to reduce the number of cycles the pump goes through when drawing water.
As for pluming fittings consider Sea Tec fittings for any place you may want to remove in the future, water heater, pump, and tanks. They are a bit expensive but great to work with and easy to reopen for service.
WBCCI 12156 AIR 3144 WACHUNG TAC NJ6
2004 Excursion 4x4
1991 34 ft. Excella +220,000 miles, new laminated flooring, new upholstery, new 3200 lbs axles