The first one is a fitting adapter which means it slides into a fitting. You need just a standard male adapter. Fitting adapters are always more expensive for some reason. Answer from Opposite-Two1588 on reddit.com
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The Home Depot
homedepot.com › p › Everbilt-1-2-in-Copper-Pressure-Slip-Coupling-Fitting-C601HD12 › 100345672
Everbilt 1/2 in. Copper Pressure Slip Coupling Fitting C601HD12 - The Home Depot
Everbilt 1/2 in. Copper Pressure Slip Coupling Fitting C601HD12
This Copper Pressure Slip Coupling is designed for hot and cold water pressure distribution systems. It features solder cups, no center stop and is typically used to connect two lengths of piping. Each coupling is suitable for both commercial and residential treatments.
(4.6)
Price   $1.39
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Menards
menards.com › main › plumbing › pipe-fittings › copper-pipe-tubing-fittings › nibco-reg-sweat-lead-free-copper-coupling-with-stop › w00720d › p-1444449326248-c-8565.htm
NIBCO® 1/2" Sweat Lead-Free Copper Coupling with Stop at Menards®
NIBCO® 1/2" Sweat Lead-Free Copper Coupling with Stop
NIBCO® lead-free fittings can be used in residential and commercial systems such as potable water, air conditioning and refrigeration. Please refer to NIBCO® technical data sheets and catalogs for engineering and installation information. In addition to its inherent qualities of beauty, durability and low maintenance, copper's reusability makes it an ideal application in sustainable projects. NIBCO® copper fittings are manufactured in an ISO 9001 certified facility, and backed by a 50-year limited warranty. Because of its longstanding reputation for innovation and precision in design and manuf
Price   $0.69
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The Home Depot
homedepot.com › p › Everbilt-1-2-in-Copper-Pressure-Cup-x-Cup-Coupling-Fitting-with-Stop-C600HD12 › 100342365
Everbilt 1/2 in. Copper Pressure Cup x Cup Coupling Fitting with Stop C600HD12 - The Home Depot
Everbilt 1/2 in. Copper Pressure Cup x Cup Coupling Fitting with Stop C600HD12
The 1/2 in. Copper Pressure Cup x Cup Coupling with Stop is used in both commercial and residential systems. With potable water, air conditioning and refrigeration systems in mind, each coupler features a solder cup and a dimple stop. The coupler allows for connecting two lengths of tubes together.
(4.7)
Price   $0.92
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Landscapeproductsinc
landscapeproductsinc.com › home › 1/2-inch copper coupling
1/2-INCH COPPER COUPLING - Landscape Products Inc.
June 27, 2025 - 1/2-inch socketed copper coupling · Repair coupling features solder cups and a rolled stop · All fittings are wrot copper manufactured · SPECS · MODELS ·
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Reddit
reddit.com › r/askaplumber › confused about fittings for 1/2 copper
r/askaplumber on Reddit: Confused about fittings for 1/2 copper
February 20, 2024 -

I am not a plumber, I'm just doing some test soldering with some scrap pieces. Initially I bought this

https://www.homedepot.com/p/Everbilt-1-2-in-Copper-Pressure-Cup-x-MPT-Male-Adapter-Fitting-W-01131EB/320899517

To solder onto 1/2" copper and it did not fit, it was the same diameter as the 1/2" pipe. Almost as if it would connect if I were going into a coupler instead (or a 90, T, etc...)

Since I found two of what appear to be the 'same' item (to me) I also bought this (which worked) and that did fit onto the 1/2" copper (cheaper to buy both vs going back).

https://www.homedepot.com/p/Everbilt-1-2-in-Copper-Pressure-Cup-x-MIP-Male-Adapter-Fitting-C604HD12/204620255

What am I missing? If it is listed as 1/2" why didn't it fit?

Thanks.

Find elsewhere
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Southern Pipe & Supply
southernpipe.com › 7012947 › Product › Viega_78192
ProPress 1-1/2 inch Copper Coupling, No Stop, Press x Press | Buy Press Couplings & Branch Connectors & More at Southern Pipe & Supply
Coupling, No Stop, Nominal Size A: 1-1/2 inch x 1-1/2 inch, Press x Press Connection, Copper, Pressure Rating: 200 psi, Temperature Rating: 250 Deg F, Standards: NSF/ANSI 61, UL, IAPMO, CSA, ABS, NFPA 13, 13D and 13R, ASTM, 2-98/99 inch Length
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Ferguson
ferguson.com › product › 1 › 2-in.-copper-coupling-(clean-bagged,-5 › 8-in.-od)-cbccd › 301941.html
1/2 in. Copper Coupling (Clean & Bagged, 5/8 in. OD) | Ferguson
1/2 in · Fitting Type: Coupling · Length: 1-1/11 in · Material: Wrot Copper · Maximum Temperature: 400 · NSF: NSF 61 · NSF Certified: Yes · Pressure - Maximum: 722 psi · Proposition 65: WARNING: Cancer and Reproductive Harm - ...
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The Home Depot
homedepot.com › p › Everbilt-1-2-in-Copper-Pressure-Cup-x-Cup-Coupling-with-Stop-Fitting-10-Pack-CP600HD12 › 204620228
Everbilt 1/2 in. Copper Pressure Cup x Cup Coupling with Stop Fitting (10-Pack) CP600HD12 - The Home Depot
Everbilt 1/2 in. Copper Pressure Cup x Cup Coupling with Stop Fitting (10-Pack) CP600HD12
The NIBCO wrot copper pressure coupling is used in residential and commercial systems such as potable water, air conditioning and refrigeration. The coupling features solder cups and a dimple stop. The fitting provides a means of connecting two lengths of tube together. In addition to its inherent qualities of beauty, durability and low maintenance, copper's reusability makes it an ideal application in sustainable projects. Options also include cleaned and bagged for oxygen service (medical gas).
(4.7)
Price   $7.80
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The Home Depot
homedepot.com › p › Everbilt-1-1-2-in-Copper-Pressure-Slip-Coupling-Fitting-C601 › 100342436
Everbilt 1-1/2 in. Copper Pressure Slip Coupling Fitting C601 - The Home Depot
Everbilt 1-1/2 in. Copper Pressure Slip Coupling Fitting C601
The 1-1/2 in. Copper Slip Coupling is used for cup x cup connections in water supply piping. It is furnished without a center stop and is used to join two lengths of copper tubing. The durable copper coupling is de-zincification resistant.
(4.6)
Price   $13.88
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PlumbingSupply.com
plumbingsupply.com › home › categories › cop-cucc-050
Copper Coupling (CxC) - 1/2"
The true value of a human being is determined primarily by the measure and the sense in which he has attained liberation from the self · Is there something else you are looking for · We accept most credit cards and PayPal Our shopping cart is secure, so you can shop with confidence
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BFO Select
buyfittingsonline.com › home › copper › sci® copper press fittings › press couplings (straights) › 1/2 in. press x 1/2 in. press - straight coupling - no stop - epdm - copper press fitting - fig sp605
1/2 in. Press x 1/2 in. Press - Straight Coupling - No Stop - EPDM - Copper Press Fitting - FIG SP605
1/2 in. Press x 1/2 in. Press - Straight Coupling - No Stop - EPDM - Copper Press Fitting - FIG SP605
Specifications / Applications: SCI Copper Press fittings provide an economical and reliable piping connection that can be used for commercial, industrial, and residential markets; eliminating the need of using conventional methods of soldering and brazing. SCI Press Copper Fittings are intended for use with ASTM B88, Types K, L, and M hard copper tubing in sizes ½" to 4" and soft copper tubing in sizes ½" to 1¼". After visual confirmation of each connection, a system pressure test may be performed in accordance with local code requirements. The SCI Press Technology fo
Price   $10.37
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Amazon
amazon.com › Copper-Coupling-Rolled-Stop-Pack › dp › B08NTZ3YXY
Amazon.com: Copper Coupling (C x C) with Rolled Stop, 1/2" - Pack of 100 : Industrial & Scientific
[10-Pack] PROCURU (Made in USA) 1/2-Inch Copper Coupling with Stop (Roll or Dimple), C x C Sweat Connection, LF Certified Safe (CWCR0012-10P)
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Plumbmaster
plumbmaster.com › plumbmaster-approved-57567-1-2-copper-repair-coupling › p › 57567
PlumbMaster Approved 57567 1/2" Copper Repair Coupling
Supplying you with all your plumbing supplies, including 1/2 x 12 Copper Repair Coupling. Free shipping over $99. Same day shipping before 5pm EST.
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MSC Direct
mscdirect.com › product › details › 45278355
Value Collection - Wrot Copper Pipe Coupling: 1/2" Fitting, C x C | MSC Industrial Supply Co.
Wrot Copper Pipe Coupling: 1/2" Fitting, C x C
Find Wrot Copper Pipe Coupling: 1/2" Fitting, C x C at MSC Industrial Supply, serving the metalworking, safety, and MRO industries for over 75 years
Price   $35.50
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Amazon
amazon.com › Copper-Coupling › s
Amazon.com: Copper Coupling
copper coupling 1/2 inch · copper tube · copper fittings · copper coupler · Previous · 1 · 2 · 320 · Next · Visit the help section or contact us · Go back to filtering menu · Skip to main search results · Popular Shopping Ideas · Hvac · Tool · Pipe · Plastic ·
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Lowe's
lowes.com › plumbing › pipe & fittings › copper pipe & fittings
Streamline 1/2-in x 3/8-in Copper Reducing Coupling W 01023L at Lowes.com
Shop Streamline 1/2-in x 3/8-in Copper Reducing Coupling W 01023L in the Copper Pipe & Fittings department at Lowes.com
Published   February 13, 2024