Should I upgrade to 3/4" pipe all the way to my new pex manifold?


I have a water meter with a 3/4" supply line that is fitted to an adaptor which then runs 1/2" to all the pipes in my house. I'm in the process of installing a PEX manifold system for some new connections and I'm wondering if there's any reason I shouldn't remove the old adaptor and just run 3/4" from the main supply to my manifold. It seems silly to leave it as is while I'm doing the other work.

The manifold has a 3/4" PEX input with 1/2" outbound PEX connectors on valves.

For what its worth, the plan is to then run one of the outputs from the manifold to the existing 1/2" copper pipe to supply the lines that aren't being added. All pipes in question are exposed and easy to access in the...

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I was reading the concept of OSX Services and it seemed very cool to me to have utilities like Dictionary, highlight-text-and-open-in-browser and a million other services that provide functionality based on what the user is currently doing.

I have heard it mention that this mechanism is more similar to how pipes work in *nix, rather than background services/daemons. For e.g. , when you highlight text on OSX and select spell-check, it is effectively piping the text (using maybe the Pasteboard) to the dictionary program and returning output.

Let us assume that I have a very resource constrained machine, which means I cant have a zillion background services running - would this (Services/Pasteboard) based approach be more efficient ?

Is there anything similar in Linux ? More precisely, a mechanism to allow me to register my pip services and allow several program to call them. Also, shell pipes may not have strong secuirty built in (conceivably a key-management...

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Sajid Rafique: A plumber showed me a pic of Red Blue pipe leaking after a few years . He wanted $9700 to do my whole 3bath house with kitchen and one heater and 3 garden outlets. He said that uponer expansion type is the best...what is your opinion?

Jogo g: Nice job how's the pex holding

Randall Kelnhofer: Thank you, great video. Very informative.

Matthew Kral: you make it look pretty easy. We have a cold water slab leak and want to get everything moved to aboveground. Plumbers want $9000 to repipe 1600sq ft house with 2 full baths and kitchen and laundry room. I was thinking of doing myself but not sure if it's too big of a task.

Mark Aspery: Thank you! Very thorough explanations.

MD Harris: I have a home I inherited, hasn't been lived in 5 yrs. currently cleaning it out now. Found out the water was turned off due to a water leak outside in the yard. Very simple run from outside meter to inside downstairs, looked downstairs and its small pvc...

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Thanks for the response Larry. As Larry noted, I would normally run a larger line for lateral runs and then downsize the fixtures runs. In a manifold system, I believe the downsizing occurs at the manifold.

Main manifolds typically have 3/4" in and multiple 1/2" out. I already have a borderline flow rate (my opinion) with fairly clean 1/2" copper fixture lines, 3/4" laterals and a 1" main. With the inside diameter of PEX being considerably smaller than copper, I'm concerned about a possible flow rate decrease on long (80-100 feet) 1/2" PEX fixture runs.

Thanks for pointing out the 3/8" sink and toilets leaders. There shouldn't be a problem there, but what about showers and baths which have full 1/2" inlets? Should I run 3/4" PEX to those? The ID of 3/4" PEX appears to be similar to 1/2" copper, although I haven't really measured.

Also, the 3/4" shower lines would have to be branched off before the main manifold. That could create a flow rate drop to the main manifold...

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Do I Need Special Tools?

No. You can use stab-in or compression fittings to make the connections. But they’re too expensive to be practical on large projects. For most jobs, you’ll want to invest in a special tool to make connections. There are several PEX connection methods, but only two that are affordable enough to be practical for DIYers: crimp rings and cinch clamps.

Crimp rings are a band of metal, usually copper, that you slip over the fitting and compress with a crimp ring tool. The main drawback to the crimp ring method is that you’ll need either separate crimping tools for 1/2-in. and 3/4-in. fittings, or a universal tool with a swappable insert (not shown). This adds a little up-front cost to this method. A combo kit with interchangeable crimp jaws starts at about $100.

Cinch clamps work more like the traditional band clamps you’re probably familiar with. You slip the cinch clamp tool over the protruding tab and squeeze to tighten the cinch clamp....

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I live in a 90 year old house in the Philadelphia suburbs that has hot water heat and nice old radiators in every room. The house is about 1400 square feet and has 9 radiators of various sizes. The system was originally gravity fed so it has 3" black iron pipes suspended from the basement ceiling. Now I need to move all of the suspended radiator piping on the west half of the basement ceiling because I'm finishing the basement.

About 9 years ago the heating system was converted to gas (from oil) and changed from gravity fed to pumped. The boiler is a Weil Mclain CGa 5, 117,000 BTU unit. The installer ran 1-1/4" copper piping to and from the boiler to the original 3" black iron pipes.

I'm very much a do it yourself plumbing person. I've completely removed all of the original black iron water piping in the house and replaced it with copper. I've also done all of the plumbing (and electrical, structural, tile, finish, etc.) on 9 bathrooms and 3 kitchens over...

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Part of making sure that your new “car wash” shower will work is providing adequate water flow. During the planning phase, we discovered that all dimensional plumbing is not created equal.

When I ordered my shower components, I asked what size supply plumbing we’d need. I’d not yet started demolition and was unsure what would be inside of my walls. I wanted to make certain that I was not planning for more shower heads than my home plumbing could handle.

Our plumbing supplier checked all of the specifications for our components and found that we’d need at least 1/2-inch plumbing supply lines to provide enough water for our configuration. (Water, not necessarily hot water… we’ll discuss water heaters in another posting.) They told me that, in our area, most bathrooms are plumbed with either 1/2-inch or 3/4-inch PEX supply lines, so our configuration would be valid either way.

Yay! Order the rough plumbing parts and let the demolition begin!


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My guess is that most people don't think twice about the water that will flow from the faucets in their new homes. You may not even give a second thought to the noise water makes when rushing through water lines. Because you are moving into a new home, my guess is you might assume a waterfall of water will cascade from each faucet and hose bib. Don't count on it. Your builder or plumber may have made a few mistakes that can restrict the amount of water that flows from faucets. These same mistakes can also cause significant water pipe noise that drowns out conversation and other pleasant sounds around your home.

If you are in the planning stages of building, you can correct these problems before they happen. A water supply pipe of a given size can only supply a given quantity of water at a given pressure and a given hydrostatic head. Hydrostatic head commonly refers to the vertical distance a water line extends. If you are trying to push water up a pipe from a basement to a...

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Description for K-Flex 6RXL100258

NOTE: For more detailed product information, see the "Submittal Sheet" document.


Insul-Lock® insulation products and accessories are widely recognized by the HVACR and Plumbing wholesale trade. They offer superior product characteristics such as cold weather flexibility, durable skin surface and exacting manufacturing tolerances.

Insul-Lock® Seam-Seal pipe insulation is an environmentally friendly, CFC-free, flexible elastomeric insulation, pre-slit with a factory-applied pressure sensitive adhesive. It is black in color and identified as Insul-Lock® Seam-Seal. This superior closed cell insulation is designed to retard heat flow and prevent condensation when properly installed. Insul-Lock® Seam-Seal pipe insulation is pre-slit with a factory applied specially formulated bonding adhesive applied to both seam surfaces and comes with convenient built-in release liners which allow for easy installation....

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There are a lot of things that I want to share with you today, and some of the topics aren’t quite deserving of their own separate posts. So, I lumped everything together in a sort of big what’s new kind of post.

I really don’t like writing multi-topic posts, as I know it can be slow and maybe even frustrating to have to wade through parts you’re not interested in. But if you like this style of post, please let me know. It seems like a good format for sharing quick news tidbits and advance review recommendations.

And as a reminder, have you entered our Klein non-contact voltage tester with flashlight giveaway? If yes, thumbs up. If not, what are you waiting for? Don’t forget to enter our KC Tool “pick your prize” giveaway as well!

Reader Question: Must-Have Specialty Hand Tools and Accessories?

Adam also asked for some tool recommendations:

I do mostly plumbing (and a little bit of electrical). Are there any specialty hand tools or power tool...

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Buy it just for the fun of it! Review by VTPete

Hey, are you reading this wondering if you should buy one of these? Well, if you want cheap, reliable transportation... don't. These kits are super fun to install and zip around with. But, they're anything but reliable given the nature of the beast. Before you install it, watch the YouTube video series by HoustonMotorized. He does a wonderful job of explaining every step. I have put over 100 miles on my bike and it's running fine and honestly, I haven't had any big issues with it. Oh, sure, the bolts are made out of ridiculously soft metal and you should tighten them gingerly and over time only. I immediately replaced the clutch cover case's bolts with nice American hex heads. And, check that carb for air leaks around the throttle assembly... but don't over tighten! Make sure the gas tank is on firmly. But don't over tighten! Look, this was really fun to install and really fun to ride. My 66cc bike (Huffy Cranbrook) goes faster...

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