Chaparral fresh water drain

[Thanson]

I just bought a 2015 Chaparral fifth wheel 345BHS and I have not been able to find a fresh water drain valve. I found a blue line with a cap on it underneath but all my other campers had a valve so I am not sure if there is water in it. Also there are 2 white open ended drain type lines with no caps or valves and I am not sure what they do. I only see one line that must go to fresh water tank and I am assuming it fills the tank and also it's the suction line for pump. I wish it had a plumbing diagram so I new my winterizing was complete.
Thanks

[chaps2018]

Assuming they are all grouped together the capped pipe is the fresh water drain and the one or two uncapped lines are fresh water tank overfill drains.

I cut the cap fitting and put this valve on.

BestPEX 51249 Metal Chrome 1/4 Turn Straight Valve, 0.5" Size https://www.amazon.com/dp/B002Z9B6U2..._5K8XBbBCHD5CM

This valve is better suited if you don’t have a pex crimp tool. I have used both and they work great.

Flair-It 16880 Plastic Straight Stop Valve, 0.5" Size https://www.amazon.com/dp/B000BOKOUQ..._PL8XBb007GXP3