What is the difference between ITEM1 and ITEM2

What does it mean union and half union?

TIA

__________________
01 Ford Excursion Powerstroke
99 E300 Turbodiesel
91 Vette with 383 motor
05 Polaris Sportsman 800 EFI
06 Polaris Sportsman 500 EFI
03 SeaDoo GTX SC Red
03 SeaDoo GTX SC Yellow
04 Tailgator 21 ft Toy Hauler
11 Harley Davidson 883 SuperLow

And there I was expecting pictures of girls trying on clothes.....

Not entirely sure, but I believe a half union is one piece, threaded on both ends and converts from one spec. to another and is a 'type' of union.
A regular union would be a two piece item that threads together in the middle to allow for the pipe on either side to be separated.

Pretty much guessing, but maybe someone who actually knows will answer for you...

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On some nights I still believe that a car with the fuel gauge on empty can run about fifty more miles if you have the right music very loud on the radio. - HST

1983 300SD - 305000
1984 Toyota Landcruiser - 190000
1994 GMC Jimmy - 203000

https://media.giphy.com/media/X3nnss8PAj5aU/giphy.gif

I suspect the illustrations with the descriptions may not be accurate. Just a wild ass guess though. Basically I see no palatable differance. Maybe trying a search engine could turn up something to answer the question. What is shown to me look like termination fittings or access fitings.
a union to me joins two pipes or whatever together a half union is not too practical in my mind. Again I am not a plumber or pipefitter though so make allowances.

Knowing you somewhat from your posts I hope this is not a trick question. A half union is perhaps where you do not quite get it on and a full union is kind of self explanitory.

I never get into helping girls to dress. Undress, yes. Dress up, why?

They both look about the same. They are threaded on both ends. The lower end seem to be 1/8 MTP but the top is threaded for a cap and to allow a fuel pressure gauge to screw on.

__________________
01 Ford Excursion Powerstroke
99 E300 Turbodiesel
91 Vette with 383 motor
05 Polaris Sportsman 800 EFI
06 Polaris Sportsman 500 EFI
03 SeaDoo GTX SC Red
03 SeaDoo GTX SC Yellow
04 Tailgator 21 ft Toy Hauler
11 Harley Davidson 883 SuperLow

and the other has a removeable cap so it can be used as a union or a terminator.

I thought both have removable caps?

__________________
01 Ford Excursion Powerstroke
99 E300 Turbodiesel
91 Vette with 383 motor
05 Polaris Sportsman 800 EFI
06 Polaris Sportsman 500 EFI
03 SeaDoo GTX SC Red
03 SeaDoo GTX SC Yellow
04 Tailgator 21 ft Toy Hauler
11 Harley Davidson 883 SuperLow

Does it matter what the difference is? Item 1 is no longer available, so you can't get it at Grainger.

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daw_two
Germantown, TN

Links:
Sold last car --- 05/2012 1984 300D Light Ivory, Red interior
Cluster Needles Paint
New Old Stock (NOS) parts

Past:
3/2008 1986 300SDL "Coda"
04/2010 1965 190D(c) "Ben"
& many more

But, but, but, it may be still available elsewhere.

True but is Item2 a close unit or way off base? Should I be asking for Unit1 which I have on one of my cars or what is closest at another place or will Unit2 work?

__________________
01 Ford Excursion Powerstroke
99 E300 Turbodiesel
91 Vette with 383 motor
05 Polaris Sportsman 800 EFI
06 Polaris Sportsman 500 EFI
03 SeaDoo GTX SC Red
03 SeaDoo GTX SC Yellow
04 Tailgator 21 ft Toy Hauler
11 Harley Davidson 883 SuperLow

I think that the two items shown in the opening post are nominally equivalent fittings. Whether they are of the same quality or not, I have no idea.

It appears to me that this is an item where Grainger is moving over from one vendor (JB Industries; claimed to be made in the USA) to another source. In this case, they aren't specifically naming the other vendor, but they note that the country of origin is China.

If you look at the catalog page, there are a number of cases where two variants of a given fitting are listed, but the one that's "on the way out" is listed as "limited availability". This is one of those items.

If you have a particular desire for the JB branded fitting - I think it's their A31482 - then you can buy it elsewhere.

With the part number, they're easy enough to find on eBay:

new old stock

newer stock

Very interesting Eskimo. That might allow me to buy a single unit instead of all 5. I will have to call them Monday

__________________
01 Ford Excursion Powerstroke
99 E300 Turbodiesel
91 Vette with 383 motor
05 Polaris Sportsman 800 EFI
06 Polaris Sportsman 500 EFI
03 SeaDoo GTX SC Red
03 SeaDoo GTX SC Yellow
04 Tailgator 21 ft Toy Hauler
11 Harley Davidson 883 SuperLow

Dress 'em up... undress 'em.....

I believe they are both half unions, but the descriptions are not very accurate.

__________________
On some nights I still believe that a car with the fuel gauge on empty can run about fifty more miles if you have the right music very loud on the radio. - HST

1983 300SD - 305000
1984 Toyota Landcruiser - 190000
1994 GMC Jimmy - 203000

https://media.giphy.com/media/X3nnss8PAj5aU/giphy.gif

In pipe fitting terms "union" is a type of connector designed to be easily or routinely separated as opposed to "couplings" that are not designed to be routinely separated.

Those parts are half unions because one side is 1/8" MPT (Male Pipe Thread - a tapered thread sealed with dope or tape, not routinely separated) and the other side at least on one is a 1/8" flare union male that a flare union female connection could attach to. The other part while the same 1/8" MPT on one side,on the other side instead of the 1/8" flare is a 1/4" of unspecified type. Both have integral Schrader valves and closing caps.

The second part very likely is a flare also, it's spec'd for refrigerants so that usually is used to fill or connect a gage set to a system, and they usually use some type of flair union. Flare fittings do not use tapered pipe thread but a straight cut thread.

Thanks to you, I just bought them and they work. Thanks again.

__________________
01 Ford Excursion Powerstroke
99 E300 Turbodiesel
91 Vette with 383 motor
05 Polaris Sportsman 800 EFI
06 Polaris Sportsman 500 EFI
03 SeaDoo GTX SC Red
03 SeaDoo GTX SC Yellow
04 Tailgator 21 ft Toy Hauler
11 Harley Davidson 883 SuperLow

You're welcome! I'm glad it worked out for you.