Sloan Diaphragm Kit Guide

Sloan Diaphragm Kits are arguably the most popular part within a Sloan flushometer that needs to be replaced. Because the diaphragm kit (also called a drop-in kit) is a popular replacement part, we think it is important to have a full understanding of how it works, how long it should last, what factors affect its longevity, how to properly service and replace it, and how to make sure you are ordering the correct model for your toilet or urinal. Read this Sloan Diaphragm Kit Guide to gain a full understanding of this common replacement part, and become a Sloan Diaphragm Kit expert. 

*Note: Sloan Drop-In Kits are a MisnomerAlthough we refer to a Diaphragm Assembly as a ‘Drop-In Kit’ we do not recommend actually dropping it into place. Diaphragm Assemblies are actually quite intricate and can easily become damaged if mishandled. We recommend just lowering the kit carefully onto the valve seat.


Understanding the Sloan Diaphragm Kit

The diaphragm assembly regulates the pressure within the flush valve. When the flushometer handle is pulled, or the sensor activated, the diaphragm acts as a regulator, controlling the volume of the flush and maintaining the necessary pressure within the unit in order to prevent water from flowing when it isn’t supposed too. 

Where is the diaphragm located within the flush valve?

The diaphragm kit sits directly below the inside cover in the top of a flush valve. 

How long will it last?

Sloan flushometer bodies last a very long time. However, some of the working parts inside them like the diaphragm assembly, need to be replaced more often. After about 250,000 flushes or about 4 years in a high traffic facility, expect parts like the diaphragm assembly and the vacuum breaker to need replacing. This is completely normal. These functional parts within the flushometer simply wear out and need replacing. This is why it is important to understand the signs that your Sloan drop in kit needs to be replaced, how to order the right drop-in kit to replace it, and how to properly install it without damaging it.

What are indicators that your Sloan drop-in kit needs to be replaced?

Signs that your drop-in kit needs to be replaced include:

  • Flushometer no longer flushes
  • Flushometer will not shut off
  • Flush is too short
  • Flush is too long

Sloan Drop-In Kit Options

Dual-Filtered versus Single Filtered: What’s the Difference?

Over time, Sloan has improved their diaphragm assemblies so they are more durable and longer lasting. Sloan came out with Permex diaphragm assemblies in 1998, and have been installing them in new Royal Flushometers ever since. These assemblies feature a dual-filtered bypass, meaning that instead of only one bypass hole for water to filter through, there are two. This lessens the strain on the bypass and makes clogging less likely. These improvements resulted in diaphragm assemblies that last up to 4 times longer than the old rubber diaphragms. 

Note: Dual-filtered permex assemblies do not come installed in Regal flushometers, but they can be installed in them when replacing regal flush valve drop-in kits.

Sloan Closet Drop-In Kit Chart

The Sloan drop-in kits listed above are for the following model Sloan flush valves: G2, ECOS, and SOLIS. They are designed for closet applications only. Click on the links below to go to the part page for the model you need:

Part #08710 Drop-In Repair Kit w/ Batteries – 2.4 GPF (Sloan model number EBV1021A)

Part #08285 Drop-In Repair Kit Closet w/ Batteries – 1.6 or 3.5 GPF (Sloan model number EBV1020A)

Part #83565 Drop-In Repair Kit Closet w/ Batteries – 1.28 GPF (Sloan model number EBV1024A)


Sloan Urinal Drop-In Kit Chart

The Sloan drop-in kits listed above are for the following model Sloan flush valves: G2, ECOS, and SOLIS (the last drop-in kit is for G2 models only). They are designed for urinal applications only. Click on the links below to view the model needed:

Part #08137 Drop-In Repair Kit Urinal w/ Batteries – 1.0 or 1.5 GPF (Sloan model number EBV1022A)

Part #08695 Drop-In Repair Kit Urinal w/ Batteries – 0.5 GPF (Sloan model number EBV1023A)

Part #85629 Drop-In Repair Kit Urinal w/ Batteries – 0.25 GPF (Sloan model number EBV1025A)

Sloan Royal Drop-In Kit Chart

The Sloan drop-in kits listed above are for Sloan Royal flushometers. They can also be installed in Regal flush valves for a longer lasting Regal diaphragm assembly replacement. They are designed for either closet or urinal applications, as per listed in the chart. Click on the links below to view the model needed in our online store:

Part #08563 Drop-In Repair Kit Dual Filtered Closet – 3.5 GPF Hi-Performing (Sloan model number A1038A)

Part #08752 Drop-In Repair Kit Dual Filtered Closet – 2.4 GPF Hi-Performing (Sloan model number A1044A)

Part #08564 Drop-In Repair Kit Dual Filtered Closet – 1.6 GPF Hi-Performing (Sloan model number A1041A)

Part #08937 Drop-In Repair Kit Dual Filtered Closet – 1.28 GPF Hi-Performing (Sloan model number A1045A)

Part #08562 Drop-In Repair Kit Dual Filtered Urinal – 1.5 GPF Hi-Performing (Sloan model number A1037A)

Part #08565 Drop-In Repair Kit Dual Filtered Urinal – 1.0 GPF Hi-Performing (Sloan model number A1042A)

Part #08566 Drop-In Repair Kit Dual Filtered Urinal – 0.5 GPF Hi-Performing (Sloan model number A1043A)

Part #82110 Drop-In Repair Kit Urinal – 0.25 GPF w/ Synthetic Diaphragm (Sloan model number A1047A)

Part #83612 Drop-In Repair Kit Urinal – 0.13 GPF w/ Synthetic Diaphragm (Sloan model number A1050A)

Sloan Regal Drop-In Kit Chart

The Sloan drop-in kits listed above are for Sloan Regal flushometers. They are designed for either closet or urinal applications, as per listed in the chart. Click on the links below to view the model needed in the webstore:

Part #08057 Drop-In Repair Kit Closet – 4.5 GPF Old Style (Sloan model number A36A)

Part #08000 Drop-In Repair Kit Closet – 3.5 GPF (Sloan model number A38A)

Part #08571 Drop-In Repair Kit Closet – 2.4 GPF (Sloan model number A44A)

Part #08114 Drop-In Repair Kit Closet – 1.6 GPF (Sloan model number A41A)

Part #08001 Drop-In Repair Kit Closet – 1.5 GPF (Sloan model number A37A)

Part #08115 Drop-In Repair Kit Closet – 1.0 GPF (Sloan model number A42A)

Part #08573 Drop-In Repair Kit Closet – 0.5 GPF (Sloan model number A43A)


Save, print, or share the Sloan Drop-In Kit Chart (PDF) for future reference.

Where to Buy Sloan Diaphragm Kits

We carry all Sloan drop-in kits And also have 6-pack quantities available for select models. To place an order, give us a call and speak with one of our Sloan product experts:

Toll-Free: 800-442-6622
Pittsburgh: 412-781-9100
Mon-Fri 8:00 AM – 4:00 PM EST

Related Posts:
• Sloan Master Repair Kits
• Sloan Control Stop Guide
Sloan Offset Adapter for Flushometers
Sloan Maintenance Schedule

Leave a Reply

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.