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Cast iron submersible sump pump with 1-1/2 inch FNPT discharge

Dayton

Dayton 3BB79 1/2 HP Submersible Sump Pump 120V AC Diaphragm 1-1/2" FNPT

SKU CH-Z82N-J1QNJ MPN 3BB79

A 1/2 HP submersible sump pump with diaphragm switch delivering 80 gpm at 5 ft head and 32 ft maximum head

  • Product typeDrain Components
  • Moves up to 80 gallons per minute at 5 ft head
  • Handles 70 gpm at 10 ft head for steady dewatering
  • Diaphragm switch activates at 14 1/2 in, shuts off at 5 in
  • Cast iron body and impeller resist wear in dirty water
  • Carbon ceramic shaft seal extends service life

Submersible Sump Pump 1/2 HP

The Dayton 3BB79 is a submersible sump pump rated at 1/2 HP for 120 V AC operation. It uses a diaphragm switch with piggyback electrical connection to automate water removal in residential sump basins.

Thermals Noise Power Draw

The motor draws 9.8 A at 60 Hz and is housed in a cast iron body with a carbon ceramic shaft seal. Flow rates reach 80 gpm at 5 ft of head, 70 gpm at 10 ft, 62 gpm at 15 ft and 50 gpm at 20 ft with a maximum head of 32 ft.

Build Fit Requirements

The pump discharges through a 1-1/2 in FNPT outlet and has a body diameter of 10 in with an overall height of 12 1/4 in. The diaphragm switch actuates on at 14 1/2 in and off at 5 in, so the basin must accommodate that travel. It is not suited for installations needing higher head pressure or larger discharge connections.

How it compares

Measured against everything we stock in Drain Stoppers, Strainers & Traps, at today’s prices. Recalculated every night.

Price $384.99
Pricier than about 90% of the 4,240 comparable items (median $31.99).

Specifications

Product
Brand nameDayton
Model name3BB79
Product typeDrain Components

Questions about this item

How do I install the Dayton 3BB79 and set the diaphragm switch so the pump actually turns on and off?

Place the pump in the sump basin, connect 1-1/2 in FNPT discharge piping, and plug the piggyback switch into a 120V AC outlet. The diaphragm switch turns the pump on at 14 1/2 in water level and off at 5 in; the step most installers miss is verifying those levels match the basin depth so the switch can actuate freely.

What maintenance will the Dayton 3BB79 need over time?

Inspect the carbon ceramic shaft seal periodically for wear and replace it if leakage appears. Clear debris from the cast iron impeller and body, and test the diaphragm switch actuation points at 14 1/2 in on and 5 in off to ensure reliable cycling.

What is the first limit I will hit when the Dayton 3BB79 runs continuously?

The pump reaches its maximum head of 32 ft, at which point flow drops to zero. Before that, flow declines from 80 gpm at 5 ft head to 50 gpm at 20 ft head, so the 32 ft head limit is the hard ceiling under sustained operation.

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