Portable Glass Rinser Parts Help Needed

[Deadalus]

It turns out that the two pipes in this thing are actually different. I can make the drain pipe work with a 1/2" FPT barb and some teflon tape, because it won't see any real pressure. But 1/2" FPT won't even start to thread on the supply pipe.

1/2" FIP at the end of a braided faucet hose fits the supply pipe. I may have to use a short one with a barb in the other end to get to the silicone hose. I'd prefer not to, because it will require a taller box to house this thing. (The braided hose is only so bendy.)

Why does the braided hose FIP connection fit the supply pipe, but a 1/2" FTP won't? Beats me. Are braided hose FIP threads not tapered?

Supply lines use compression (flare) threads at the valve. FIP is female iron pipe. Those 1/2" FIP connections in my experience typically come from China where they adopted the British straight threads it seems on the fixtures' connection to the supply line (think Hong Kong). The BSP connections need a gasket or a variation but don't use teflon tape or pipe dope. And in most cases BSP and NPT don't play well together because the threads are cut differently, but each does have straight and tapered variations. BSP is British Standard Pipe. By itself (BSP) it generally is straight (parallel -P) threads as that's the standard and NPT is National Pipe Threads, which by itself, is pretty much always tapered (T) as that's the standard. Straight pipe threads need a gasket usually, tapered gets the teflon or pipe dope. The supply line you have therefore is 1/2" female iron pipe (FIP) but the threads are BSP( or BSPP). Big box suppliers know that China is making a lot of fixtures so the stores have the braided supply lines acting as an adapter to make it "easier" for you. There are 1/2" BSP to 1/2" NPT adapters (possibly a coupling instead). Kind of depends on where the supply is coming from and where the waste is going to. You might want to go to garden hose threads (GHT) for instance on the supply to connect to hose/spigot. And then what type of container is the waste travelling to?

 

[Deadalus]

Here's the adapter. G thread is the same as 1/2" BSPP and note these have a washer which I believe you would need. Some of the adapters sold do not have a washer included.
https://www.amazon.com/Fitting-Conv...8JCLHLDK/ref=psdc_13749581_t2_B083XL866R?th=1Once you get to NPT you can usually convert to many other connections types like PVC, sweat, barbed, etc.

 

[VikeMan]

I had thought about G-thread/BSPP, and whether that might be what my pipe is. I do know that NPS fits. Would that be expected with BSPP? If the pipe really is BSPP, I'm thinking this might be the most elegant solution:

https://www.amazon.com/gp/product/B07H6QRNSC/

 

[DuncB]

This " thread " is more confusing than usb adapters.

 

[Deadalus]

I had thought about G-thread/BSPP, and whether that might be what my pipe is. I do know that NPS fits. Would that be expected with BSPP? If the pipe really is BSPP, I'm thinking this might be the most elegant solution:

https://www.amazon.com/gp/product/B07H6QRNSC/

The threads are different even if BSPP and NPT Straight. They are close though but most information I have seen says they are incompatible with the exception that I have seen places where it is stated that 1/2" can work together. I ran into this problem with a second faucet I installed for a bottle washer. I got it off of Amazon and it was made in China. They sent multiple adapters with it but I still had problems hooking it up. I think they had sent 3/8"NPT adapters but it's when I found out they used G threads in China. It's possible that the supply hoses my be NPT straight, I could be off on that part about the big box stores, but it's not commonly used in general. Usually when something is FIP or MIP they are NPT (tapered). Like FIP is the same as F-NPT and MIP is the same as M-NPT. Sinks and toilets which have the stop valves were traditionally 3/8" compression with those metal flared tubes. Tubs and showers used to be sweat joints or NPT at the fixture, usually 1/2". Now things are more replaceable for homeowners so they make them screw in. Replacing a sink faucet is relatively easy these days, you don't need a torch or other special tools where in the past you really did need a plumber. I always make sure the thread sizes are specified in detail or I don't buy it. They usually give you the supply hoses with a faucet so I don't pay attention as much on the fixture hose connection.

I can say that the supply hose pictured earlier is definitely a straight thread on the 1/2" side as it has a gasket, which straight threads need. Garden hose threads are straight, that's why that rubber piece is necessary on those. I don't have anything that is NPT straight to say what the gasket might look like but in pictures they are often flat. The supply hose pictured has more of a dome shape rubber though.

DN15 is an ISO standard but it simply is the metric way of designating a nominal pipe size, here 15mm for I think the inner diameter. Which is why I was thinking it is BSPP. Even though the Brits use BSP thread sizes they are on the metric system plus 15mm is the outer diameter of their formerly designated 1/2" copper pipes. DN15 doesn't explicitly mean the threads are parallel however so the company using that is causing the confusion and exacerbating it by using an ambiguous nominal pipe size of 1/2" which could be BSP or NPT as well as tapered or parallel!

 

[Deadalus]

This " thread " is more confusing than usb adapters.

Yes, with usb being slightly more confusing than monitor cables which to really screw with you monitor cables are moving to USB-C. With all of it being more confusing if you are older having lived through the various types but the younger people think you are confused because you are old. I used to connect a cassette player to a computer for storage and turn the dial on the TV to channel 3 to use the computer after flipping the switch on the antenna jack. Not that it was a vacuum tube mainframe or anything. Kids are like, "What's the old man babbling about this time?!"

 

[DuncB]

@Deadalus
Been there done all of those.
HDMI a bit of confusion as well.