[scottz]

I have this one. https://smile.amazon.com/gp/product/...?ie=UTF8&psc=1

It works great transferring water from an external tank or bladder. I connect it to the city water connection, set the fresh water valve to fill and watch it go. I used it on several different trailers a couple months ago; worked every time.

Buy a spare impeller kit to go with whatever pump you buy; they don't last forever. https://smile.amazon.com/Wayne-66059...V1VRQ7B0A2ECM3

PS: You can use your water tank vent just like the old gravity fill ports. Just pop off the cover, pull out the screen and stick a hose in it. But filling through the city water connection is easier and just as fast.