1.8 GPM, 60 PSI 12V Shurflo $79.99 at Northern Tool (800-556-7885) Item #2687-2204.
Much more output than stock and is on-demand, so pump runs only when valve is open.
You need to cut a small (.5 X 2") section out of the sprayer body to make it fit.
It has Viton valves and a Sanoprene diaphragm, but don't leave full-strength stripper in it for a couple days. Dont't ask how I know.
Been using a new stock Multi-Sprayer until I get around to ordering a replacement diaphragm for the Shurflo. It's a lot sloooower than the old one with the Shurflo.