I have pipes with 1/2" od and 3/4" od. what sizes should i buy? i bought 3/4" norminal coupling from another seller, id of coupling is 7/8".

For Copper, OD = Nominal (ID) + 1/8". So 1/2" OD = 3/8" Nominal, and 3/4" OD = 5/8" Nominal. But these are not very common sizes, I would double check your pipe size.

I have pipes with OD 5/8 - nominal is 1/2". Not sure if fittings are name after the pipes it fits (nominal), or is the actual fitting measures?

1/2 “ ID dimension is the actual size (nominal) it is used for plumbing applications

End to end length of 1-inch coupling is 2 inches.

Does the 1/2" copper pipe go on the inside of the coupling or the outside?

Inside the coupler. some, like these, have a stopper inside the coupler that limits how far each pipe penetrates - others dont.

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🔧 Elevate your plumbing game with PROCURU – where precision meets durability!

BUILT TO LAST - Crafted from durable, clean copper for long-term performance in both residential and commercial settings.
CERTIFIED SAFETY - NSF/ANSI 61 Annex GM certified, guaranteeing safe use with potable drinking water.
PROUDLY AMERICAN MADE - Manufactured in ISO-approved USA facilities, supporting local craftsmanship and quality control.
PERFECT FIT EVERY TIME - Engineered for a snug 1/2-inch copper pipe connection, ensuring leak-proof reliability.
PROFESSIONAL GRADE ASSURANCE - Backed by a 30-year warranty, trusted by plumbing pros nationwide.

The PROCURU 1/2-Inch Copper Coupling with Stop is a professional-grade plumbing fitting designed for secure C x C sweat connections. Made in the USA from high-quality copper, it is NSF/ANSI 61 certified safe for potable water and backed by a 30-year warranty, making it the trusted choice for both residential and commercial plumbing and HVACR applications.

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Size	0.5 Inch (1/2")
Material	Copper
Brand	PROCURU
Colour	Copper
Item dimensions L x W x H	30 x 19 x 19 Millimeters
Connector Type	Coupling
Thread Size	0.5 inch
Exterior Finish	Copper
Thread Type	NPT
Item Weight	0.13 Pounds
Number of Pieces	10
Manufacturer	PROCURU
Country of Origin	USA
Item model number	CW-CRCC-0012-10
Product Dimensions	3.05 x 1.91 x 1.91 cm; 58.97 g
ASIN	B01M4IKLY7

[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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