I plan to use it to replace an existing pump. Whatis the "tall" dimension with the outlet facing up?

It is 3.5 inches from the rubber suction cups to the top of the output outlet. The pump also works if you lay it on it’s side.

Will this work in a small outdoor waterfall

The pump will take water up to a modest sized waterfall or a small brook. I have 2 similar pumps at my home, both work well and seem to be very long lasting.

Will the plug fit down a 15/16 inch pipe? I need this for an 3 tired fountain

If I remember correctly, no. I had to make a step up splicer for the largest hose that fit their largest adapter. I don't remember their largest size, but I was only stepping up to a 5/8" hose from their largest available hose size. It was a challenge and had to think outside the box but it can be done, good luck!

Brand	CWKJ
Colour	Black
Material	Stainless Steel, Rubber, Copper
Style	Submersible
Product Dimensions	5.8L x 7.1W x 8.1H Centimeters
Power Source	Corded Electric
Item Weight	5.6 Ounces
Maximum Flow Rate	6.66 Gallons Per Minute
Maximum Lifting Height	6.56 Feet
Voltage	110 Volts
Manufacturer	CWKJ
UPC	755101403129
Item model number	26-011
ASIN	B07FVPLD99

Fountain Pump, 400GPH Submersible Water Pump, Durable 25W Outdoor Fountain Water Pump with 6.5ft Power Cord, 3 Nozzles for Aquarium, Pond, Fish Tank, Water Pump Hydroponics, Backyard Fountain

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