Weird, only thing I could figure is that there may have been multiple spray heads in that shower at some point. A main shower head and perhaps a couple of side jets. It’s not a balancing loop.
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Learned the hard way, that would not work. Friend wanted dual shower heads. Learned a TON about balancing loops. Never would have thought about it. 1/4" lines though, hey, maybe toilet is near the shower, and you can have adjustable temp in the bidet, so long as you run the shower 
ROFL
I wanna know if its a loop… grab that crescent wrench and pop off the white lines and blow already!
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I’m guessing the pipe is to hold pliers onto while attaching the tees maybe? A lot of signs point to a shitty plumber lol.
And why reduce the 1/2” to 1/4”, only to have two 1/4” lines that are presumably on at the same time? I want to get into your walls man, let’s track those white lines down.
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Seriously why i thought he ran outta pex. Some shit id do gor real. Sometimes you just gotta make it work.
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1/4 " supply lines usually ice maker stuff.
You might want to check that out thats fucked up shit right there.
Joe Homeowner at his best
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That’s on a wood floor, there has to be a way to see that pipe from underneath, and what it’s doing.
Complete guess. I think that’s a closed loop, possibly being used as a demented way to warm something up. It should always be full of water, unless there is a drain down below.
Been in construction forever and I’ve never seen anything like that… we are obviously dealing with a “genius savante” type of plumber here. 
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I can see that for a toilet mixing hot with cold so it dont sweat.
Never in.my 20 years of remodeling professionally have I seen anything.remotely like that shit.
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I’ve been a plumber for 27yrs and that the dumbest shit I’ve seen in a long time.
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I will say everytime somebody runs the shower there is water shooting out the ends of those white lines unless they are capped
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I’m guessing bidet. That is a lot of fittings for very little function. Lol.
Best of luck there.
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Any chance it’s the cold water supply to your refrigerator’s ice maker/water dispenser? If your kitchen is on the other side of that wall I bet that’s where it goes. But, it’s going to the floor below??? got me.
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That was my first guess as the First contractor cut mine to take out wall. That never rain it to the new spot. My second guess was does it go down to a humified if your furnace is below? I have one of those hanging because I gave up on a furnace humidifier.
Or just something stupid. Me I would be tearing out walls/floors. 
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It’s after the mixer for the shower head- I would hope it isn’t. Whatever it is, it’s probably meant to be run with the shower.
The only reason I can think you’d mix copper in there would be that’s what was on hand… but still why crimp the fuck out of it…
You should get an inspection cam and follow the lines. They’re cheap on Amazon.
Come on guys… We’re on OverGrow… it feeds the RDWC in the basement!!! 
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I think @G-paS has another good guess. A furnace humidifier.
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After coming back from the bar you are sacked 
No extra jets, I spent an hour looking at shower install plans and pics on the net, and saw lots of multiple shower head set ups but nothing like this it’s stumped me.
I am going to get a quater inch pex collar and borrow my brother in laws crimper mine only does 3/4 and 1/2 inch.
I can see them from the basement they come through the floor and head across top of the furnace ducting and the ceiling of the bathroom I
built. I thought they might be heading to the other upstairs bathroom thats about 20 ft away but can’t see them appear anywhere in there connecting to anything.
No more like plain stupid, the shower in the other bathroom has the valve working in reverse, when you lift the arm on the mixer valve, the water starts hot and gets colder as you lift it. Something else on my to do list to correct.
Fridge came with the house, no icemaker and it’s 35ft from the shower, I pulled it out to check yesterday along with the dishwasher.
Yes the furnace is almost directly underneath it and it does have a separate unit that humidifies and de humidifies the air and mixes it with the heatpump. These pipes go completely the wrong direction when they come through the floor and I can’t see any pipe that small connected to the humidifier unit.
Good guess they were growing weed in the basement illegally, but in pots with soil 
[quote=“Dank-D, post:29, topic:60338, full:true”]
I’ve been a plumber for 27yrs and that the dumbest shit I’ve seen in a long time.
[/quote
I am not a plumber, but I am thinking the same thing, even with my limited knowledge I can see it seems stupid lol.
So I am going to disconnect one end of the white 1/4 inch pipe and blow down it and see what happens, if I don’t get water or air coming out the other end of the connection I will open up the faucet and see if that produces water at that connection point, and see what the water pressure is like from the shower head. If I block both open ends and then try all the taps and anything that uses water to see if there is any disruption anywhere.
Thanks everyone for your input, I appreciate it, and will report what Intel I can gather asap.
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Ok, that made my morning… Well played!
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I once found a copper line buried in a concrete floor feeding gas to a clothes dryer.
I thought I was going to blow up the basement when I pulled it out.
Just remembered that. I must’ve blocked it from my memory 
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I don’t know why but I thought it was a pex connection on those white pipes, just whipped one end off with the crescent wrenches, no water comes out.
I put about 20 deep blows down the end, there was some back pressure but that cleared after about 10 blows. I play the didgeridoo so I can do cyclic breathing, to maintain constant out pressure whilst breathing in. Never thought I would need that skill for plumbing lmao.
I tried pulling on the pipe to see if it was unconnected but can’t move it an inch even.
Turned on the faucet and water comes out at the connection and not the shower head, which is what I thought would happen.
Checked everything else in the house when disconnected, nothing has changed anywhere. If the ends were connected to anything else I would have thought there would be a pressure build up or water coming out.
I wonder if I attached my airbrush airline to it and put about 50psi through, it might make something come out the other end.
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THIS RIGHT HERE… 100%…
I have seen some seriously interesting rube goldberg looking things done by people who either don’t have the parts, tools or knowledge… Jury-rigging things together… Best was an entire outer wall in a kitchen had notches cut halfway thru the studs to run another outlet. They literally cut a small square over each stud in drywall, somehow chiseled / cut out half the stud to run the wire. WAY more work than just taking a big section of drywall down, and drilling the studs and running the wire properly. I ended up having to sister all the studs and drill the holes myself… And the plumbing in that house? Don’t even get me started! Vents that ended within walls, random valves to nothing, and the strangest fill system for the boiler that had no check valve (i.e. boiler water could be pushed back into the house water lines). Some people really have no clue and shouldn’t take on home improvement projects, at least not without supervision. Others, never worked a day in construction and can build a house to code…
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