Same o.d., same fittings, you won't notice a difference in flow from the change in i.d. Answer from Shmeepsheep on reddit.com
🌐
Family Handyman
familyhandyman.com › home › skills › plumbing › pipes
Differences Between Type L and Type M Copper Pipes
September 10, 2025 - But for normal in-wall household plumbing, Type M works fine. When it comes to copper piping for water lines, acidic water with a pH of seven or less can be hard on copper pipes. If you have a well and find out from testing that the water is acidic, you may want to use the thicker-wall Type L pipe or plastic CPVC pipe and fittings.
Discussions

Type L vs M copper pipe?
Same o.d., same fittings, you won't notice a difference in flow from the change in i.d. More on reddit.com
🌐 r/Plumbing
62
6
September 22, 2021
Do I have Type M or L copper?
L copper has blue lettering and M copper has red lettering. More on reddit.com
🌐 r/askaplumber
71
13
June 22, 2024
Any benefit to Type L copper over M for under raised house in mild climate?
It's a higher grade product. Half ton vs one ton. The wall thickness does make a difference in flow rates between the two. More on reddit.com
🌐 r/Plumbing
18
5
March 22, 2023
Copper re-pipe type L/M
In places with bad water quality L is much better and will buy you an extra 10-20 years of life. If you have decent water quality type m can still last 30-50 years easily, but only if properly installed. Number one failure is caused by not reaming the pipe, this causes cavitation in the water which will cause pinholes eventually. This will happen to L also if not reamed but will take much longer. From there it is a preference issue. More on reddit.com
🌐 r/Plumbing
23
2
June 17, 2022
🌐
COPPERTUBINGSALES
coppertubingsales.com › collections › type l hard copper pipe 20 ft. lengths
TYPE L Hard Copper 20 FT Lengths — COPPERTUBINGSALES
2″ Type L Copper tubing 20 ft length—ASTM B88 certified for plumbing, solar, HVAC. U.S. shipping in 1–2 days.
🌐
Taylor Walraven
taylorwalraven.ca › copper-tubing-data-Type-L.php
Copper Tubing Data - Type L | Taylor Walraven
Technical Information related to materials and finishes used on Taylor Pipe Supports products, as well as industry standard design properties of pipe.
🌐
Munotmetalloys
munotmetalloys.com › home › difference between copper tube types – l vs k vs m
Difference Between Copper Tube Types - L vs K vs M
June 23, 2025 - Finally, because it’s more corrosion-resistant than other home piping materials like CPVC or PEX, M copper tube has a longer lifespan and less maintenance required. Type L copper tubing is referred to as ‘medium wall,’ with a wall thickness ...
🌐
Reddit
reddit.com › r/plumbing › type l vs m copper pipe?
r/Plumbing on Reddit: Type L vs M copper pipe?
September 22, 2021 -

Im swapping out original copper water lines with new copper while I already have a few walls opens. I haven’t cut into the old lines yet to determine whether it’s type M or L and there isn’t printing on the pipes indicating it, but the question is this. If I upgrade what I currently have access to, to type L for longevity purposes, am I going to have issues with flow restriction? Any issues with mixing in type L if the original is type M?

Find elsewhere
🌐
Ferguson
ferguson.com › pipe & tubing › copper tubing › type l tubing
Type L Copper Pipe | Ferguson
Shop Type L Tubing at Ferguson. Find expert-curated Type L Tubing products from the #1 US plumbing supplier and top distributor of HVAC, waterworks, and MRO products.
🌐
Muellerstreamline
muellerstreamline.com › home › products › copper tube › plumbing copper tube
Plumbing Copper Tube - Mueller Streamline Co.
March 15, 2019 - With a full line of copper tube products to support most all plumbing supply and DWV applications manufactured in accordance with applicable standards, our ongoing commitment to quality continues to make Streamline® Copper Tube the preferred and specified brand of industry professionals. Streamline® Copper Tube for use in plumbing and mechanical applications. Available sizes (Type K, L, M, & DWV) ranging from ¼” to 8” in diameter.
🌐
Apollo Plumbing
apolloplumbing.net › home › apollo services › plumbing repairs everett, wa › copper pipe repair › type l vs type m copper: key differences
Type L vs Type M Copper: Key Differences | Apollo Plumbing
June 16, 2025 - Type L has a medium wall thickness. It is strong enough for most indoor plumbing and heating systems. It also works for some outdoor use. Available in rigid and flexible copper tubing. Color code: Blue.
Price   $$
Address   1239 State Ave., 98270, Marysville
🌐
Lowe's
lowes.com › plumbing › pipe & fittings › copper pipe & fittings
Streamline 1/2-in x 5-ft Copper Type L Pipe LH04005RT at Lowes.com
October 30, 2025 - Streamline® Copper Tube sets the standard for quality, consistency and service in the plumbing industries. Copper Type L Pipe is perfect for residential services. Used for its thicker wall tube and its rigidity makes for a neater installation.
🌐
American Copper & Brass
acandb.com › collections › brands › 1/2" type l copper pipe - 10' hard
Cambridge-Lee 1/2" Type L Copper Pipe - 10' Hard — American Copper & Brass
1/2" Type L Copper Pipe - 10' Hard
**Products 10ft+ must be delivered on our local trucks. We run routes within a 200-mile radius of our warehouse locations. See checkout for delivery options.** Primary vendor is Wieland and seasonally stocked by CAMBRIDGE-LEE and MUELLER. If you require a specific vendor, please contact
Price   $34.95
🌐
Amazon
amazon.com › Watts-Pre-Copper-Tubing-Type › dp › B00R0EI2YK
Amazon.com: Watts Pre Cut Copper Tubing Type L 1/2 " Od. X 10 ' : Industrial & Scientific
Buy Watts Pre Cut Copper Tubing Type L 1/2 " Od. X 10 ': Plastic Tubing - Amazon.com ✓ FREE DELIVERY possible on eligible purchases
🌐
CA
oehha.ca.gov › proposition-65 › proposition-65-list
The Proposition 65 List - OEHHA
December 5, 2025 - The current Proposition 65 list is available on-line below, as a pdf or Excel download or through WestLaw. The Excel document also includes the listing mechanism for each chemical listing and the safe harbor level, if one has been adopted.
🌐
Ashbylumber
ashbylumber.com › p › copper-tube-type-l-hard-34-x-2 › 4692653
Copper Tube Type L Hard 3/4" x 2
Your Trusted Building Partner From lumber and hardware to custom doors and windows, Ashby has everything you need. Our expert team will help you every step of the way. Order Online Now Bringing Excellence to the New Ashby Website! From lumber and hardware to custom doors and windows, Ashby ...
🌐
Ussupply
ussupply.com › home › tubing › copper tubing › 1" id x 20' copper tubing, straight hard, type l
1" ID x 20' Copper Tubing, Straight Hard, Type L
1" ID x 20' Copper Tubing, Straight Hard, Type L
Streamline copper tubing is incised-marked and color-coded in accordance with ASTM B88 to support proper identification and compliance on job sites. Type L is widely accepted by national and local codes for use in potable water systems.
Price   $159.60
🌐
The Home Depot
homedepot.com › p › Cerro-2-in-x-10-ft-Copper-Type-L-Hard-Temper-Straight-Pipe-2-L-10 › 100354225
Cerro 2 in. x 10 ft. Copper Type L Hard Temper Straight Pipe 2 L 10 - The Home Depot
Enjoy the Cerro 2 in. x 10 ft. Copper Type L Hard Temper Straight Pipe 2 L 10, durable for a variety of plumbing and heating purposes, can be utilized for interior gas, steam and oil lines from The Home
🌐
Consumerspipe
consumerspipe.com › copper & brass › type l copper tube
Pipe Copper & Brass Type L Copper Tube | Consumers
Copper Tubing (17) Update Search · Manufacturer · Approved Vendor;Mueller Industries (6) Mueller Industries (7) Mueller Industries;Approved Vendor (4) Update Search · SIZE · 1 FT (1) 1 in (1) 1-1/ 2 in (2) 1-1/ 4 in (2) 1/ 2 FT (1) 1/ 2 in (1) 1/ 4 in (2) 2 in (2) 2-1/ 2 in (1) 3 in (1) 3/ 4 FT (1) 3/ 4 in (1) 3/ 8 in (2) 4 in (1) 5 in (1) 5/ 8 in (2) 6 in (1) 8 in (1) Update Search · Type · Type L (7) Type L;Type LH (4) Type LH;Type L (6) Update Search ·
🌐
Wikipedia
en.wikipedia.org › wiki › Duralumin
Duralumin - Wikipedia
November 23, 2025 - Duralumin (also called duraluminum, duraluminium, duralum, dural(l)ium, or dural) is a trade name for one of the earliest types of age-hardenable aluminium–copper alloys. The term is a combination of Düren and aluminium.
🌐
Cleveland Clinic
my.clevelandclinic.org › health › articles › 23089-collagen
Collagen: What It Is, Types, Function & Benefits
May 26, 2022 - Your body also needs the proper amount of vitamin C, zinc, copper and manganese to make the triple helix. Collagen’s main role is to provide structure, strength and support throughout your body. ... Helping fibroblasts form in your dermis (middle skin layer), which helps new cells grow. Playing a role in replacing dead skin cells. Providing a protective covering for organs. Giving structure, strength and elasticity to your skin. Helping your blood to clot. Some 28 types of collagen types have been identified.