Look up your engine. Order. About $30.00. Gravity works well, and I always add another quart as the original oil is finishing draining out to 'flush' the last sediment solids out. The only thing to use these is you must have enough working room around the bottom/side of the engine. I use half gallon milk jug to move the oil out of the engine pan area to a larger container. I keep the last gallon oil jug to start putting old oil into. They have two models, one with a simple hose barb (not the permanent type) to shove a hose onto for draining, the other type has threads for installing a permanent hose on. The 1/4 turn valve has a positive detent so it can't be inadvertently knocked open. The even sell a plastic safety clip to completely prevent the valve from being opened accidentally.
In retrospect, it would depend how much you want to spend on an entire 'oil change system' or just want an easier way to get oil out. For me the 'once a year' oil change does not warrant the extra money or time to invest in a stand alone oil change pump and piping. (But I only put on a couple dozen hours a year.) Maybe if I used the boat hundreds or a thousand hours a year it would be more cost effective.