Thank you for your question! This is a 6600 series Delta Select model. If you are getting reduced flow, we recommend to try flushing the lines. You can also soak the cartridge in white vinegar to help remove mineral buildup.
To access the internal parts, please make sure that the water supplies are turned off to the home. You can then unscrew the cap on the front of the handle by turning it counter-clockwise by hand. A rubber jar opener may help grip this piece. The Polished Brass ring does not unscrew. Once the cap is off, you can remove the Phillips head screw, slide the handle and sleeve off, then unscrew the bonnet nut and pull out the cartridge.
Below is a How-To Video for flushing the supplies:http://www.deltafaucet.com/shopping...
answered 2 weeks, 3 days ago