Delta

Stem Unit & Seats - 1600 Series

Model#: RP1991

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RP1991 is rated 4.5 out of 5 by 2.
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  • Use with Delta 1600 series tub and shower faucets
  • Will not tarnish or corrode
  • Backed by Delta Faucet’s Lifetime Limited Warranty
California Prop 65 WARNING
Finish: Not Applicable
List Price*: $42.70
Base Parts
RP1991
List Price*: $42.70

Product Support, Repair Parts & Technical Specifications


Installation Information


Rated 5 out of 5 by from just as promised The parts came quickly and were just as promised. Installed quickly and did the trick.
Date published: 2010-11-22
Rated 4 out of 5 by from really reliable I am very pleased with the service. Could not find the right replacement. found your website, and it was a life saver. Otherwise, I would have had to replace the whole faucet... Thank You
Date published: 2010-06-05
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how to adjust for more hot water? any photo or diagram? i don't want to break my cartridge

Asked by: dougulus
Thank you for your question, dougulus! The 1600 series cartridge, part number RP1991 has a visible set screw located on the brass stem that can be easily adjusted to allow hotter water. Best regards, Edward
Answered by: Delta Faucet
Date published: 2019-08-11

Where exactly do the rubber seats and springs get inserted? Thanks

Asked by: Henry
Hi Henry, Thank you for your question. The seats and srings will be located behind the RP1991 stem unit in the valve body itself. The spring's wider end goes in the hole first and the opposite tapered end of the spring is then covered by the rubber seat. Thanks, Dave
Answered by: DeltaFaucet2
Date published: 2016-05-16

Does this protect from shower going scalding hot if a toilet in second bath gets flushed?

Asked by: Flattop
Thank you for your question. Delta Faucet model # RP1991 was used in the 1600 series model faucets. It was used in the pressure balanced and non-pressure balanced faucets. The cartridge itself is not pressure balanced.
Answered by: Delta1
Date published: 2013-10-22

Where can I find a new set of springs for the rubber seats?

The new cartridge comes with new rubber seats, but no springs.
Asked by: Zeb
Hi Zeb, Thank you for your question. The spring is available as a single piece as RP3427. You get 2 seats and 2 springs in RP4993. Most hardware stores or home centers should stock the RP4993 but would have to order the RP3427. Thanks, Dave
Answered by: DeltaFaucet2
Date published: 2016-06-13

What bonnet and sleeve can be paired with this stem?

I believe I will reuse the escutcheon I have (although it is not preferred). I am also wondering what handle - prefer a knob rather than a lever-type handle.
Asked by: crazyratt
Hi crazyratt, Thank you for your question. The bonnet nut for the 1600 series is RP6079 and the sleeve is RP6081. The knob handle that will work with your model is H71. The escutcheon plate is RP7577 (no diverter hole) or RP7578 (with push-button diverter hole). RP6079: http://www.deltafaucet.com/repairparts/details/rp6079.html RP6081: http://www.deltafaucet.com/repairparts/details/rp6081.html H71: http://www.deltafaucet.com/repairparts/details/h71.html RP7577: http://www.deltafaucet.com/repairparts/details/rp7577.html RP7578: http://www.deltafaucet.com/repairparts/details/rp7578.html Best regards, Jon
Answered by: DeltaFaucet3
Date published: 2018-02-18

Is there a trim kit on the market compatible with this unit?

I have an old Delta Scald Guard trim kit that I need to replace and this is the unit RP1991 in the wall (not the plastic cartridge) that is compatible with the trim kits I have found on market (primarily using your site, Home Depot and Lowes). Please point me in the right direction! I have uploaded images of the fully assembled trim kit that was on their, the
Asked by: Jamie
Jamie, thank you for your question. We have available the cartridge (Delta part #RP1991), however, the square escutcheon plate is not available. Our round escutcheon plate (Delta part #RP6083) is available to use, but the hole size in the wall would need to be smaller than the square. We recommend replacing both the rough-in valve as well as the trim.
Answered by: Delta
Date published: 2016-02-11

Will Delta part #RP6083 fit my

Please see picture. I have this cartridge RP1991 installed. The crystal knob is very close to the wall, and the hole on the wall is very small. Will plate #RP6083 fit? If it does, do you have a bronze one? if RP6083 won't fit, what do you recommend? Thank you very much!
Asked by: Grace
Hi Grace, Thank you for your question. Delta Faucet model RP1991 is for a 1600 series faucet and model RP6083 is for a 600 series faucet. We do have an escutcheon plate that will fit your 1600 series faucet with model RP7577, but it only available in Chrome finish. Thanks. Jody
Answered by: Delta1
Date published: 2014-12-29

I just discovered that the hot and cold operation is reversed on my RP1991. Can this be corrected by reversing the cartridge or do I need a plumber to switch the pipes in the wall?

Asked by: Bikeracer161
Thank you for your question, Bikeracer161! The RP1991 cartridge is found on the 1600 series and moving the handle from the right to the left, starting cold then moving to hot. The raised stop on the cartridge should be placed on the left of the valve as this is usually where the hot water is coming in from, however this cartridge can be reversed for back-to-back installations or situations where the supplies are reversed. Best regards, Edward
Answered by: Delta Faucet
Date published: 2018-11-28
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