Unidentifiable Connections?

[Cracker727]

New to the forum and hope someone can help me. We have a new 1/2 ton Series Cougar 25RES and are just learning about all the switches, buttons, levers, and connections. In the Water Compartment I have two connections for which I would like to know their purposes. I do not remember the initial owner’s tour informing us as to their purposes. I believe Conn B is the Black Tank flush connection but since it is not specifically labeled, I am only making an educated guess. I have attached a photo in which I have labeled the two mystery connections Conn A & Conn B. If you can help me out please reply.

Cracker727
2016 F-250, 4X4, 6.7L
2018 1/2T Cougar 25RES

[Brentw]

Having a guess here. Conn B, due to the sticker placement should be the black tank flush. And the only other option for conn A would be the winterizing intake.

[ctbruce]

Originally Posted by Brentw

Having a guess here. Conn B, due to the sticker placement should be the black tank flush. And the only other option for conn A would be the winterizing intake.

My GUESS also. Makes most sense. B also has the access port below it for the hose to come up through. Double confirmation.

[Kojac]

I had the same problem with a Laredo 2016 Fifth Wheel, I was able to take it to a State Park 5 miles from the house and hooked up the sewer hose, filled up one connection to see what came out, than filled the other tank repeating the same thing. After that I painted the hose connection center Black for black tank and the other one grey for grey water tank. Hope this helps.

[BAK]

On my 2018 Half Ton 25RES The hose connection on the far right (conn B) is the black tank flush. The one on the left under the winterize shut off valves (conn A) is the intake for winterizing. I made labels for mine since apparently Keystone didn't feel the need to label them.

[DOWva]

Yes I agree with BAK, B is the black tank flush and A is for winterizing the system.