Water Leak in Kichen area

[falconrk]

New to RVs. I have a new Kingsport and have 1 weekend trip on it. Was getting it ready for a Labor Day weekend trip and switched on the water pump and had fresh water coming from under the sink. Dealer is telling me it'll be mid-Nov. before I can bring it in for warranty work (after research I'm finding this is common) so I'm going to attempt a repair on my own. While fixing the leak I'd like to install inline cutoff valves on the out flow lines from the pump but can't find a reference to the line diameter? Can anyone help?
http://https://www.facebook.com/photo/?fbid=4440033179372781&set=pb.100000984276666.-2207520000..

[PaddlePAT]

Check ALL of your water connections and ensure they are tight. I had a leak in my new 2021 19RBS and discovered the connections to the kitchen faucet were loose.