Sloan Royal Diaphragm Assembly - For use with Royal Flushome
✅ PROS
- Solid construction for reliable performance
- Practical tool for home projects
❌ CONS
- May vary based on individual needs and preferences
- Check Amazon for current pricing and availability
The Verdict
If you’ve got a Sloan Royal flushometer that’s running continuously, ghost-flushing at 2 a.m., or delivering a weak half-hearted flush, the problem is almost certainly the diaphragm assembly. This genuine Sloan replacement is the part that fixes it. It’s not glamorous, but it’s the difference between a toilet that works and one that wastes hundreds of gallons a month.
What You Actually Get
The package contains the complete diaphragm assembly: the Permex synthetic rubber diaphragm, the retainer ring, and the filter screen. As shown in the product image, it’s a one-piece replacement — you don’t have to disassemble and swap individual components. Everything you need except a flathead screwdriver is in the box.
Performance and Real-World Use
The Permex material matters. Standard rubber diaphragms degrade, harden, and lose their seal in 3-5 years, especially if your water has high chlorine or mineral content. Permex resists that breakdown significantly longer — facilities managers routinely report 7-10 year service life between swaps. For a part that costs less than a tank of gas, that’s exceptional value.
Installation is genuinely simple. Turn off the water supply, remove the cap from the flushometer body (the large brass or chrome nut on top), lift out the old assembly, drop in the new one, and hand-tighten the cap. The filter screen catches sediment before it reaches the diaphragm, which is the leading cause of premature failure. If you’ve replaced one of these before, you’ll have it done in five minutes. If you haven’t, a YouTube video and ten minutes will get you there.
What Buyers Consistently Praise
The 4.6-star rating across 229 reviews reflects a product that does exactly what it claims. One reviewer noted, “Fixed the running toilet in my rental in under 10 minutes. Genuine Sloan part, perfect fit, no issues.” Another long-time facility manager commented, “I’ve used these for years in commercial buildings. They last longer than any aftermarket replacement I’ve tried.”
The most common refrain is relief that it’s a genuine OEM part rather than a third-party substitute. Aftermarket diaphragms are cheaper, but they often have slightly different tolerances that cause leaks or premature wear. Buyers consistently report that paying a few extra dollars for the real thing saves headaches later.
Where It Falls Short
The honest critique: Sloan sells the bare diaphragm (part number 107) for roughly half the price. If your existing retainer ring and filter screen are in good condition, you can save money by buying just the rubber piece. The full assembly is the smarter buy if you’re already in there and want everything fresh — but budget-conscious shoppers should know the option exists.
Also, confirm your flushometer model before ordering. This fits Royal and Royal II models with the modern plastic cap design. If you have an older unit with the brass cap, this won’t work — you’ll need a different part. Measure your cap diameter if you’re unsure.
Who Should Buy This
- Homeowners with a Sloan Royal flushometer — this is the fix for running, weak, or intermittent flushing
- Property managers and landlords — buy several and keep them in your maintenance kit; this is the most common repair for these units
- DIYers replacing an aftermarket diaphragm — if your last replacement failed quickly, this genuine part will last far longer
Skip it if your flushometer is a different brand (Toto, Kohler, Zurn) or if you’re certain you only need the bare rubber diaphragm.
FAQ
Q: How do I know if my flushometer needs a new diaphragm? A: Symptoms include continuous running, random ghost flushing, weak flushes that don’t clear the bowl, or water leaking from the cap area. If you have any of these, the diaphragm is the first thing to replace.
Q: How long will this diaphragm last? A: With normal municipal water, expect 5-7 years. With hard water or high chlorine, you’ll get closer to 3-5 years. The Permex material resists degradation far better than standard rubber.
Q: Do I need any special tools? A: No. A flathead screwdriver to remove the cap is all that’s required. The assembly drops in place and hand-tightening the cap is sufficient — do not overtighten, as that can warp the seal.
The Verdict
Buy it if you have a Sloan Royal flushometer with a running, weak, or inconsistent flush. This is the correct OEM part, it’s easy to install, and it will resolve the issue for years.
Skip it if your flushometer is from a different manufacturer, or if you’re on a tight budget and have a clean retainer ring you can reuse with the cheaper bare diaphragm.
Rating: 4.6/5 — It loses half a star only because the full assembly price is higher than the bare diaphragm option for those who don’t need the extra parts. But for most buyers, the convenience and guaranteed fit make this the right choice.
Where to Buy
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Last updated: 2026-08-06. Ratings and prices current as of review date. Verify on Amazon before purchasing.
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