MP100 · Master Plunger
The big toilet plunger
The biggest bellows toilet plunger in the lineup, moving 10 cups of water on each full stroke.
$15.49Price updated 28 September 2026
Grab This Plunger on AmazonNot the one? For a low-flush or elongated bowl with a narrow outlet, the MP1600 and its funnel nose seal better. If you only need a sink plunger, the Shorty is smaller and easier to store.
The MP100 stands 21.5 inches tall and pushes 10 cups of water per stroke, the most of any model here. That volume is meant for the stubborn toilet clog a regular cup has already failed on. Its stepped tri-level nozzle also seats in a kitchen sink or a garbage disposal drain.
An automatic air relief valve lets trapped air out as you press. Seat it, press slowly the first time, and the air leaves through the valve instead of lifting bowl water over the rim. One owner found the valve works through a slot in the handle threads, so how far you screw in the handle changes how much air bleeds out.
| Model | MP100-3 |
|---|---|
| Water displacement | 10 cups, per the maker |
| Air relief valve | Yes. Automatic |
| Head | Tri-level nozzle |
| Made for | Toilets, Kitchen sinks, Garbage disposals |
| Options | Black · Navy blue |
| Size | 12.5 in tall (Black) |
| Maker's claims |
|
Owners who liked it talk about speed: a slow kitchen sink running clear in seconds, and a full sink cleared with two gentle strokes by an owner with bad shoulders. The complaints are about size and stiffness. One owner called it too bulky for ordinary toilet clogs, another couldn't get it to compress, and a few mention water splashing back on their hands.
Don't flush again. If the bowl is near the rim, close the shutoff valve behind the toilet.
Lay old towels around the base and put on rubber gloves. Keep a bucket close for bailing.
You want water over the plunger's nose and room below the rim. Bail some out if the bowl is full, or pour some in from a jug if it's low.
Put the nose into the outlet at the bottom of the bowl. Press down slowly the first time, so the air leaves through the valve instead of lifting water over the rim.
Pull up to fill the bellows, then push down firmly. Keep a steady rhythm for 15 to 20 strokes without breaking the seal.
Press down slowly on the first stroke so the air in the bellows leaves through the valve. Once the bellows hold water, work steady strokes and keep the nose seated.
It comes in two parts, and the handle screws into the bellows. Screw it in firmly, because a loose handle lets air leak and weakens the push.
It's big for a bathroom basin, and the push can spray out of the overflow. The Shorty or the Mighty Tiny suits that sink better.
Owner reviews of the Master Plunger 100, word for word, the good with the bad. Reviews cover the whole model family, so a review may mention another color or bucket.
Master Plunger MP100-3. This plunger is like when your Mom was standing there making sure you cleaned your room; since buying this, we haven't had a single toilet clog! It's like insurance! But I did experiment with it, and decided that any clog would be no match for this thing. It is powerful and simple to use, and doesn't leave a black ring in the bowl. It's also lightweight and fun to look at. Good purchase!
I bought this primarily to clean bathroom sink drains. It is far superior to the old style plungers. Used it on my toilet stool also and again did an amazing quick and easy job of it. The only thing I wish it had was a holder for it. so for now I just put it back in the bag and store it under a bathroom sink.
I only bought this because the color matched my bathroom decor. It was a waste of money.There are far better, more efficient alternatives that all cost less. This thing may be good for deep water. Too bulky for regular toilet clogs.It’s big and the pleated part at the bottom can and does get toilet waste all in between it- yuk.The few times I had to use this, I was disappointed. Just buy a regular plunger, this is a waste.
This Master Plunger and it's accordian functionality works ever so much better and faster then the red rubber cup type with the wooden handled ones I grew up with. Definitely not going back to the old ones!
The toilet plunger that actually works when applied against reasonable & applicable situations
This plunger is very hard stiff plastic. It does not work at all, as you cannot achieve any compression with it. I tossed it out and bought a different one.
MP500
All-purpose plunger with a bucket
from$15.77
See optionsMP500-C5
Plunger, toilet brush and a shared holder
from$29.95
See optionsMP1600
For 1.6-gallon low-flush toilets
from$15.99
See options
