It’s all about the guts.
The 9920 has a heavy gauge steel grind ring, galvanized steel turntable, and stainless steel impellers. These are the primary components involved in doing the grinding work. Since the grind ring and turntable are not stainless steel, they will eventually corrode.
The 9930 has a stainless steel grind ring, swivel impellers, and turntable. That makes the 9930 extremely corrosion resistant.
Honestly, the price difference is small, especially since you’re buying a machine that should last you many years. It’s important to note that the warranty on the 9920 is 2 years, whereas the warranty on the 9930 is 5 years. That right there should tell you what Waste King really expects from these products.
- 1/2 HP Motor
- 2 Year In-Home Service Warranty
- 3-Bolt Mount with Stainless Steel components
- 36 Inch Power Cord pre-installed
- Non-removable splash guard
- Safe for properly sized septic tanks
- Stainless Steel impellers, galvanized steel turntable, and heavy gauge steel grind ring
- Grinding chamber is made of Corrosion Proof Glass Filled Polyester
- Continuous Feed (Wall switch activated)
Continuous Feed vs. Batch Feed
There is no performance difference between the batch feed and continuous feed disposals. Continuous feed is the most commonly used type, and is activated by a wall switch. You simply feed food scraps in as you run water down the drain and activate the switch.
In case you’re not familiar with batch feed, you load the disposal with food scraps then use the stopper to activate the disposal. This means the drain is closed before the disposal will activate and nothing else can enter the disposal except water that’s allowed to flow through the stopper. You can see how this would be safer with kids around as no hands can enter the disposal once it has been activated. When you remove the stopper the disposal automatically cuts off.
The Waste King 9920 is a continuous feed, but if you’re looking for a batch feed Waste King puts a “TC” at the end of their name. Check out the Waste King 9930TC for a 3-bolt mount type batch feed.
Is 1/2 HP enough power?
I’ve been using a 1/3 HP disposal for years and I find it is plenty of power. I cook daily and dispose of vegetable scraps and meat trimmings. With a 1/2 HP, you will have to grind a shorter amount of time and it should shake less compared to lower horsepower disposals when dealing with a heavy load.
Yes, you will have no trouble from a 1/2 HP disposal. The extra power isn’t much more expensive than the 9910.
Note: Here are the official recommendations by Anaheim Manufacturing Company (they make Waste King disposals).
“All types of food waste can be put down your disposer such as vegetable peels, fibrous materials, small bones, fruit pits, etc. Make sure when you do grind materials that you run lots of water through the sink while the unit runs. Items that you SHOULD NOT put down your disposer include large whole bones, clams, oyster shells, whole corn husks, glass, china, plastic, bottle caps, tin, aluminum foil, utensils, caustic drain cleaner, hot grease, or other hot liquids.”
Installation & the 3-Bolt Mount System
First, a little bit about the 3-bolt system compared to the EZ Mount. Though Waste King says there isn’t any difference between the durability of the two mounting systems, the 3-bolt system is made of stainless steel whereas the EZ mount is made of aluminum and plastic. There are fewer steps to install the EZ mount system, but don’t let that be the deciding factor since this is an install, if done correctly, will only need to be done once. It isn’t that difficult and if you prefer the stainless steel then don’t let the mounting difficulty sway your decision. Also, the splash guard for the 3-bolt system is not removable, which for most people doesn’t seem to be an issue.
There are a few things to be aware of before you do the install.
- You need Plumber’s Putty. It goes around the sink flange to ensure no leaks occur. Some guides completely miss this step and it is one of the easiest places for a leak to occur.
- You should have a standard 3 pronged outlet in place under your sink.
- If you have a dishwasher, you attach the dishwasher discharge hose to a designated port on the side of the disposal. You must knock out the plug in this port before attaching. DO NOT knock out the plug if you won’t be attaching a dishwasher hose.
The power cord should come already attached to your Waste King disposal. Many other disposals don’t even come with the cord, but this helps ensure you don’t end up with wiring issues that fry your disposal.
The dimensions of the 9920 are 9″ x 9″ x 14.3″. Depending on the piping you have in place you may need to use an extension to get everything to match up correctly.
Official Waste King Installation Videos: Click Here
Frequently Asked Questions about the Waste King 9920
Q: What’s the difference between the 9920 and 9930?
A: As mentioned above, the 9920 has heavy gauge steel and galvanized steel components in the grinding chamber. The 9930 has all stainless steel components inside. The 9920 will corrode over several years.
Q: Can the 9920 be hooked up to a dishwasher?
A: Yes, there is a plastic knock-out plug the opens the port for the dishwasher hose. Don’t knock it out unless you plan to hook up the dishwasher.
Q: Does the 9920 come with a splash guard?
A: Yes, it is not removable. You will need to get a disposal with an EZ mount if you want a removable splash guard.
Q: Is the 9920 compatible with any sink flange?
A: Yes, sink flanges are a standard size for kitchen sinks.
Q: Does it come with a power cord?
A: Yes, all Waste King disposals come with a 36 inch cord already attached to the unit.
Q: Does it come with everything needed for installation?
A: All of the components are there, but you will need some Plumber’s Putty to get a water tight seal on the sink flange.
Warranty for the Waste King 9920
The 9920 comes with a 2 Year In-home Service Warranty. This means that if at any time during the first 2 years, your Waste King disposer has a material or mechanical defect then Waste King will replace it free of charge.
You do not have to register your disposal, just have the serial number on hand when calling their customer service (1-800-854-3229). It is located on the side of the disposal.
If you’re wanting a more corrosion resistant disposal with the same 1/2 HP, check out the Waste King 9930. It has all stainless steel grinding components.
If you’re looking for more horsepower, check out the Waste King 9940 which has 3/4 HP. It also has the same stainless steel, corrosion resistant grinding components as the 9930.