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2" Semi-trash Water Pump

Model #6919

Starting At

$619.00 MSRP
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Generac ST20-S Semi-trash Water Pump

Specifically engineered to handle muddy or sandy water, the ST20-S is powered by a 169cc Generac G-Force engine that pumps up to 158 gallons per minute. With features such as low-oil shut down, custom Easy Prime™ funnel design for quick and easy priming, and a large fuel tank with integrated fuel gauge, it’s both durable and easy to use.

Durable 1” frame to withstand the harsh environment

Powerful Generac G-Force 169cc engine with low-oil shut down

Large 3-gallon fuel tank with incorporated fuel gauge delivers approximately 5 hours runtime

Onboard instructions with icons of key touch points make this pump easy to use

Easy Prime™ custom funnel design with tethered priming cap for quick and easy priming

Color-coded suction and discharge ports to ensure the correct hose connections (Blue = Discharge; Green = Suction)

Easily pumps up to 158 gallons per minute

Silicon carbide mechanical seal for long life

Generac <strong>ST20-S Semi-trash Water Pump</strong>
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Rated 5 out of 5 by from Great running machine Had 8” of rain in a short time. Runoff of rain between my house and neighbors was knee deep of water. Sump pump in basement was running every 30 seconds. Ran Generac pump 24 hours a day for a week to pump off water. It worked flawlessly. Great machine.
Date published: 2022-09-11
Rated 5 out of 5 by from Starts east, works great! I love this pump. I use it to drain a low spot in my yard when we get a lot of rain. I am able to save the grass by pumping the water out. I only have to use it once or twice a year. It always starts up on the first or second pull!
Date published: 2022-08-25
Rated 4 out of 5 by from Semi trash pump Very nice for clear water. Bought this for semi trash removal for sediment in the bottom of a back yard pond. Worked great until we got to the bottom sediment. Found we needed to stir the sediment and get a 10% mix (90 water-10% sediment. Took about three pulls to start the engine. After about 10 starts we noticed the start pull rope is staring to fray. Contacted the store where we bought it they referred us to Generac for service.
Date published: 2019-06-26
Rated 5 out of 5 by from Incredible Product The ST-20S pump was very easy to set up and operate, worked admirably right from the start and continues to do so. I purchased it in an emergency situation to reduce/control the water level in a low area near my house that was resulting in water inflows to the basement. It primes easily, runs quietly and smoothly and moves a lot of water, even through over 150 ft of discharge hose. I'm so impressed I bought a second one to help out neighbors and for use as a back-up should I ever need it. It is a great product!
Date published: 2019-06-13
Rated 4 out of 5 by from Easy set up, onboard instruction on unit Pumped standing water behind our house off, that was causing sump pump to continually run in our house. Another 2" rain coming and ground is saturated. Pump worked great to remove surface water.
Date published: 2019-05-16
Rated 5 out of 5 by from easy setup and starting awesome pump was easy to setup and start used for emptying my crawl space due to flooding . it took 3 1/2 hrs to completely drain my crawlspace under a 1600 sq.ft. home due to flooding from river. pump still had a 1/2 tank of fuel when finished couldn't believe how well it did outperformed a rental pump used the last time this occurred . highly recommend this pump to anybody who has flooding issues . it was worth every penny spent to purchase don't know why i didn't do this sooner. thanks again Generac for an awesome product!!!!
Date published: 2018-12-07
Rated 5 out of 5 by from Awesome product. Bought this to pump out my 1 acre pond. Did a wonderful job running continuously for 3 days in 90 degree weather. Only issue was the pump drain plug. Appears it got too hot and has melted the threads and damaged the o-ring seal. Now to find and order parts for it. Still highly recommend this product.
Date published: 2018-06-01
Rated 5 out of 5 by from Very efficient. The product was able to clear about 18" of standing water in a very short amount of time. It is very efficient and runs a long time on one tank of fuel. I would highly recommend it for anyone needing to clear standing water. The reason for the standing water was accumulation of two inches of rain in Wisconsin in the winter when the ground is frozen and the water has no where to go.
Date published: 2018-01-30
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ST20S-6919 is rated 4.7 out of 5 by 9.
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