Review on Original Delta RP19804 Cartridge Assembly for 1300/1400 Collection Faucets Replacement Part - Genuine Delta/Peerless by Shawn Trotter

I just watched a video online and changing cartridges was a lot easier than I thought. I had a problem and I'm not sure why I had this problem, but it didn't fit right and the shower head leaked a lot when I turned on the water. I experimented with this a bit, but the only thing that worked for me was taking the blue part of my old cartridge and just using it with the white and gray part of this new cartridge. After I did that it was a tight fit and my leaky showerhead was completely gone.