Name: Shurflo Aqua King II Supreme 5.0
Brand: Shurflo
Price: 359.09 USD

A high-flow marine pump that is easy on the batteries for its 5 GPM. It is the most expensive pump here.

Price checked November 9, 2026. As an Amazon Associate we earn from qualifying purchases.

Pros

Cons

The Shurflo Aqua King II family

Every Shurflo Aqua King II model we rank, smallest first. Ratings compare each against its own flow.

Model	Flow	Rating	Price
Shurflo Aqua King II Junior 2.0	2 GPM	2.0/5	$114.80
Shurflo Aqua King II Premium 4.0	4 GPM	2.8/5	$236.33
Shurflo Aqua King II Supreme 5.0 (this one)	5 GPM	3.1/5	$359.09

How it scores

The rating comes from 6 measured or published factors, each scored 0-100 against fixed reference points for its flow. How we rank explains each one.

Value $71.82 per GPM ($359.09, 5 GPM)0
Flow 5 GPM rated open flow75
Pressure 55 psi shut-off71
Efficiency 0.71 GPM per amp (7 A max)100
Features internal bypass, runs dry without damage, thermal protection, strainer included65
Warranty warranty not published, scored as none0

A low-cost 4 GPM pump for a trailer owner who wants more flow than the stock pump. Its sibling 5 GPM model costs only a few dollars more.

$59.99

4 GPM45 psi

A heavy-duty 4 GPM, 60 psi pump with a 3-year warranty at a fair price, for boats and RVs with two fixtures.

$165.60

4 GPM60 psi11.5 A

A marine-grade 4 GPM pump for boats and larger RVs with several fixtures. It costs more than pumps with similar flow and pressure.

$236.33

4 GPM55 psi10 A