A newer rig with no HW bypass and no suction hose?
Easy to install put 2 way valve in where hose comes from tank it will shut the tank feed off and allow pump suction, put hose in anti freeze and turn pump on open each faucet till its pink, shut valve and your done. I would also put a HW bypass on if you can get to it no need to fill tank with 6 gallons of the pink stuff.