09 Tahoe Q5I, drain on seat cooler rear

[DVANECK]

Hello Everyone, just took the tahoe out again to Lake Roosevelt, here in Az . And I noticed the rear seat storage cooler on the left of the back on the boat had water in it, so I checked and there are hoses that connect to a drain on the back of the boat, below the water line. Am I supposed to have a plug in that? And if not is the a valve in the hoses that only allows water to flow one way? Any answers appreciated. I don't have a manual for this boat. And it's my first running boat I have ever had, so trying to figure out everything. Found several issues after I took her home but have them all worked out now, like speedo , was inoperable because vent on drive was plugged up, lights didn't work, found a wire disconnected, you know small issues that come up with Years of previous owner use. The hose connects to this hole on the transome

 

[DVANECK]

Also the area I'm talking about is under the seat in the rear of the boat, which can be a a cooler area fill with ice or storage, which I use for storage, it filled about 1/3 of the way up

 

[Scott Danforth]

put a plug in the drain line on both ends if not using as a cooler. put a plug on the inside end if using as a cooler. (pull plug while underway or on trailer to drain water)

 

[DVANECK]

Thank you, that was my plan, but wanted it to be right, the way it came that's why the question