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Cast iron submersible sewage pump with tether float switch and 20 ft cord

Dayton

Dayton 3BB87 4/10 HP Sewage Pump 115V Tether Float Switch

SKU CH-ZW8S-07MNK MPN 3BB87

A 4/10 HP submersible sewage pump with tether float switch delivers 95 gpm at 10 ft head

  • Product typeDrain Components
  • 4/10 HP motor handles residential sewage loads
  • 115 V tether float switch enables automatic operation
  • 2-inch solids passage reduces clogging risk
  • Cast-iron body and impeller resist corrosion
  • 20 ft power cord simplifies placement

Submersible sewage pump with tether float

The Dayton 3BB87 is a submersible sewage ejector pump rated at 4/10 horsepower for 115 V single-phase supply. It uses a tether float switch with a piggyback plug for automatic on and off operation. Cast iron construction covers the body and impeller while a carbon-ceramic shaft seal handles abrasive liquids. The unit includes a 20 ft power cord for direct connection.

Suited for residential sewage basins handling 2

This pump suits homeowners or contractors moving raw sewage or wastewater containing solids up to 2 in diameter from a basin or pit. The tether float requires enough clear space to swing freely, so cramped sumps or tight enclosures may prevent reliable switching. Buyers who need a vertical float for narrow pits, higher head pressure than 20 ft, or a different voltage should look at other models.

Flow rates at three head points determine fit

At 10 ft of head the pump delivers 95 gpm, at 15 ft it delivers 70 gpm and at 20 ft it delivers 37 gpm. Compare these three figures against the system curve of the installation to confirm the pump can meet the required discharge volume. If the needed flow at the actual head is not covered by these points, the pump will not perform as required.

How it compares

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

Price $569.99
Pricier than about 90% of the 4,240 comparable items (median $31.99).

Specifications

Product
Brand nameDayton
Model name3BB87
Product typeDrain Components

Questions about this item

What size discharge pipe and basin opening does the 10 3/4 in body diameter require?

The pump has a 2 in solids-handling discharge and a 10 3/4 in body diameter, so the basin opening must be wider than 10 3/4 in and the discharge piping must accept a 2 in connection.

How do I wire the tether float switch with its piggyback plug, and what clearance mistake should I avoid?

Insert the pump cord into the piggyback plug, then plug the piggyback into the 120V AC outlet; position the tether so the float can travel between the on and off points without contacting the basin wall or piping.

Which wear parts will need replacement on this cast iron pump with a carbon ceramic shaft seal?

The carbon ceramic shaft seal is the primary wear component; the cast iron impeller and body resist abrasion from 2 in solids, but the seal should be inspected periodically and replaced if leakage appears.

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