My dad and I are trying to replace a Delta shower cartridge behind the nob. When we take off the cartridge and just let the water flow in from the pipe it has high pressure but as soon as you put in the old or new cartridge the water trickles out of the faucet and doesn't even have enough pressure to reach the shower head.

We have cleaned out those pipes and the blockage happens when you put in the new or old cartridge. The cartridges fit exactly and are actual delta replacement parts. If you need any additional pictures or videos please ask because we are in desperate need.


  • Hello, and welcome to Stack Exchange. How about a picture of the old and/or new cartridge? – Daniel Griscom Oct 29 '18 at 1:02
  • The one above is the old cartridge which worked before we took it out and doesn't now. We have tried multiple new ones and have returned all. This is also a project with my dad so I can't take the old one out of the wall right now because he is not with me. – user92517 Oct 29 '18 at 1:03
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    Are you sure you're putting it back in the right way? They only fit one way but some people like to force things. When you turn it on, does the handle turn as much as it did before replacing the cartridge? When you turn it on without the cartridge, did you test both hot and cold water individually? Is the cartridge one or two pieces? When you have it apart, take a picture of the inside of the faucet. Also take a picture of the cartridge. – HazardousGlitch Oct 29 '18 at 1:41
  • I will have to take these pictures tomorrow. And yes I put it the right way. The handle turns the exact same way it did prior. Without the cartridge and you turn on the master water you can feel hot and cold coming out. How do I test individual? Copper pipes straight into the water spook canvas sn – user92517 Oct 29 '18 at 2:10
  • I accidentally didnt finish the previous comment, as I was, the pipes are copper and soldered to the water appliances. Also comment above auto corrected some thing please ignore – user92517 Oct 29 '18 at 2:11

The symptoms you describe are those of installing it upside down. It may APPEAR to work correctly because the handle turns in the same manner, but is in fact not.

  • The only thing that could happen if it's upside down is that the hot will come first when you open the valve. – aofkj Oct 30 '18 at 4:19

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