Matching up fresh water connections

[Mickeyrouse]

My old (40 yrs?) Grohe faucets are past the point of repair. So I’m going with Scandvik faucets. The problem is the match-up of the connections. The old Grohe uses Fast-Tite fittings manufactured by Parker Hannefin (the Racor people) while the new Scandvik uses 1/2” NP fittings. I’ve been searching the net for some kind of adapter, but the freshwater lines appear to be a proprietary size. Anyone encounter this, and if so, how did you deal with it?

[jordanbigel]

My boat uses a similar system by Whale, but I know nothing about the Parker fast tight system.

I don't suppose this is it? Look like it.

https://www.amazon.com/Parker-Fast-T...00G1Q7MEE?th=1

[Mickeyrouse]

Originally Posted by jordanbigel

My boat uses a similar system by Whale, but I know nothing about the Parker fast tight system.

I don't suppose this is it? Look like it.

https://www.amazon.com/Parker-Fast-T...00G1Q7MEE?th=1

Yeah, that’s it. The Fast-Tite system has worked well. Never had any leaking problems, easy to use. But matching up.....

[Sand crab]

I don't understand the problem? They make NPTF to NP adapters. Is this all you need?

[Mickeyrouse]

Originally Posted by Sand crab

I don't understand the problem? They make NPTF to NP adapters. Is this all you need?

I know about those. The question is NPS to Parker’s Fast-Tite proprietary thread. I have to mic the line ID. It may be a common size.

[OS2Dude]

Could you use a PEX-B fitting? The description is very similar, especially to the push-to-connect (sharkbite) fittings. I redid the plumbing in our 1985 Catalina 30 with PEX-B.

[sv_pelagia]

I wouldn't surround my solar controller with water pipes, connections and pump! Asking for trouble eventually....

[Mickeyrouse]

The plastic supply line is 3/8” OD. So, what I’m looking for is a 1/2” NPS male coupling that will slip over a 3/8” OD plastic ( PVC?) line. I don’t care who makes it, but I haven’t found it yet.

[Sparx]

Check out a company called Fresh Water Systems. They will have this

[Sand crab]

Originally Posted by Mickeyrouse

The plastic supply line is 3/8” OD. So, what I’m looking for is a 1/2” NPS male coupling that will slip over a 3/8” OD plastic ( PVC?) line. I don’t care who makes it, but I haven’t found it yet.

SharkBite fittings work with lots of different pipe. I've used them a lot in construction. They make a 1/4" ID, 3/8" OD fitting with a male or female threaded end. Then you just need a bushing or adapter. There's other brands than SharkBite also and right there at your home improvement store.

[Mickeyrouse]

Originally Posted by Sand crab

SharkBite fittings work with lots of different pipe. I've used them a lot in construction. They make a 1/4" ID, 3/8" OD fitting with a male or female threaded end. Then you just need a bushing or adapter. There's other brands than SharkBite also and right there at your home improvement store.

I looked at the SharkBite website. While they generally imply their fittings will accommodate 3/8” line, none of the specific items that I saw show a 3/8” option.

[Sand crab]

Is this it?
https://www.sharkbite.com/products/b...ucing-coupling


Also look at the other brands. Typical house plumbing will be 1/2" pipe which is then reduced to 1/4" or 3/8" for the supply lines under the sinks or for the ice maker in your fridge. There will be an angle stop or straight stop shutoff valve. The valve also reduces the line so accomplishes 2 jobs at the same time. We have been using plastic pipe supply lines which are designed to fit perfectly in the brass compression fittings forever.

[Mickeyrouse]

Went to my local Ace hardware, who stocks SharkBite. Upon examining, I find that SharkBite slips INTO the line connected, thus it refers to the ID of the referenced line. Fast-Tite refers to the OD, and is designed to slip. over the outside of the line it connects to. If SharkBite were to work, the applicable size would be 1/8”, the ID of the line. Pipe sizes are nominal anyway, so a proprietary line like Fast-Tite may or may note have sizes that relate.

[Mickeyrouse]

Resolution:
In talking with an industrial supply house in Houston, turns out that the full range of Fast-Tite fittings is more than their proprietary thread pitch. So they do make an NPT compatible. Cost: $2 ea.