I use these for operating the air bucket and could be used for the Pop off valve.
Here is the part number for the version that has screw type connections so you can use your own wires. They sell another version that comes with a two wires on either side of the valve for pos and neg but the wire is really small. I like the version that is the screw termial type or other wise know as a DIN connector.
12 volt, 1/8" NPT ports. Powered both ways.
About $50 a piece, they charge a handling charge on each order so I usually order a few to offset the cost of handling
Here is a pic I found off the internet. Although the part number is incorrect on the picture. The Part number I provided above is correct.
Here is a pic of the one with the wire attached. If you want to go that route.
Again the part number is incorrect on the picture. For this version with wires the part number is Part# MME-41PEE-W012