For you northerners here is an idea that works well and is cheap. 5 gal bucket, 3/4 galv nipple with 2 nuts, female pipe to male hose thread adapter, garden hose valve,6 ft 3/4 garden hose and one male and one female hose end. Drill hole in bottom of bucket(side bottom)allow for nuts. Attatch nipple and use sealant. let setup. install adapter and valve to nipple and then install hose ends on hose. now you have a bucket with a hose attatched. put it on the boat transom well above the outdrive and put in your favorite antifreeze 50/50 or whatever you need for your area..(I save my old from the truck and use it). Start the engine and open the thermostat. Swap fresh water hose on the muffs to the bucket rig. open the valve on the bucket, start the engine and when antifreeze comes out the OD your done. Drain the block and save the antifreze in spring before you put it in the water. Gotta be easy on the environment.