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Published on Sep 8, 2010
So, you have a Delta 1400 Series bathtub faucet, and there's water leaking from the spout. You can repair this yourself with no special tools required (just a small flathead screwdriver and a Phillips-head screwdriver) and parts that you can get at a local hardware or plumbing supply store like Lowe's or Home Depot. You can do the repair in five minutes. It may seem daunting to do your own plumbing repairs, but this one is straightforward and easy.
If you are lucky, you only need to replace the seats and springs. This is Delta part number RP4993 (Seats & Springs - Repair Kit) and costs around $4. After replacing the seats and springs, if you still have a leak, then you need to replace the entire valve cartridge, Delta part number RP19804 (Valve Cartridge - Repair Kit), which costs around $40.
First of all, SHUT OFF YOUR WATER SUPPLY - find the main valve and close it. Turn on the bathtub faucet and let the remaining water drain out. Follow the video to see how to dismantle the faucet.
At around 1:35, you can't see it very well, but I'm using the small flathead screwdriver to gently (gently!) pry the valve cartridge out of the brass pipe. Put the screwdriver head between the pipe and the cartridge and carefully nudge it out, maybe with a little twist of the screwdriver.
At 2:17, I pop out one of the seat/spring combos. Replace both sets with new ones and reassemble everything back together. If this doesn't fix the leak, then replace the entire valve cartridge. The valve cartridge is that whole blue-and-white part that I'm holding at 1:58.