Thread: Plumbing help

So I'm in need of a new water filter at my place so I went ahead and purchased a 3M Aquapure. After doing some research I found out that it requires 3/8" fittings which would make for a fairly easy installation assuming that my water valve accommodates said measurement (I stupidly assumed so).

I purchased all the fittings and adapters, set up the entire filter and then went to connect it underneath my sink. Much to my dismay, my valve has 7/16" fittings

I'm now stuck with an entire filter unit and not sure where to go from here. I have the following 3/8" x 3/8" x 3/8" T-fitting which would have worked had my water valve been 3/8":



I would need something that would adapt this fitting to the 7/16" male end of the valve which I believe I found but the problem is, I can't find anything that will allow me to connect the 7/16" hose into the top of this T-fitting.

Also, the plumber who installed the old filter unit has a bizarre reducer fitted to the outlet hose leading to the filter faucet and I have no idea what the size is. Maybe 1/4"? If that's the case, I've found nothing that accommodates a 1/4" male to a 3/8" female connection (nothing lead-free at least).

Seeing as everything is open, I don't think I can return any of this. Some help would be appreciated on how to piece all of this together. Feel free to laugh at my stupidity in all of this.

I have a friend who DIY's things into sizes that are no longer available.

Would this fit the bill?

https://www.amazon.com/Brass-Adapter.../dp/B001NS3E56

or its counterpart

https://www.amazon.com/Brass-Adapter...4JNGXB21WQKBPV

Kees, I did see those but it appears that they are not lead free so I'm not sure if they were made to be used for water lines. The brass fittings I have purchased thus far are all lead-free.

It appears my only option is to replace both the valve and the braided hose leading to the cold water faucet. This would completely solve the valve side of the equation. Now to figure out what the filter faucet hose is.

So I managed to figure out most of my issues with the setup. Problem is the plumber many years ago installed a dishwasher bypass on the cold water pipe which is one of the connections to the old filter.

It appears to be a needle valve. Problem is, it won't close. No amount of turns (in either direction) will stop water coming out of this bypass, nor do I know how to cap this. I wanted to avoid calling a plumber but it seems like I have no choice at this point.

If you shut your domestic water supply, you can pull the old valve and put a new 1/4 turn ball valve in. If you have a set of wrenches you can do it yourself. I would go through the trouble of replacing all the angle stops under your sink if they aren’t already ball valves.

I wouldn't be worried about the small amount of lead in brass, usually less than 5% because the soldered fittings in your house are a way greater source of lead entering your water especially hot water.