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Deluxe Shower Sump System

4137, 4138 Mounting Instructions

Attwood marine hardware, navigational lighting, bilge pumps, and other

marine accessories are specified more than any other brand by America's

best-known boat manufacturers as original equipment. Look to Attwood

for quality replacement parts and marine accessories.

SAVE THESE INSTRUCTIONS

Form Number 69274 Rev. K

The Attwood Deluxe Shower Sump System is an efficient, low cost system

incorporating an Attwood 750 GPH Pump and an Attwood Automatic Float

Switch. This system is designed to satisfy the needs of the boater for a

functional means of transferring "gray" water from the shower, or other

water drains. Multiple inlets can be hooked up to more than one drain with

different hose size options. The see-through top on the box allows you to

see when the filter needs cleaning.

Refer to the chart below to ensure that you have selected the proper shower

sump for your boat application:

Shower Sump

D.C. Voltage

Model

4137

12.0

4138

24.0

WARNING:

To prevent personal injury, never use 120/240 VAC power tools while

working in water or a wet environment.

To prevent personal injury, always disconnect the power source before

servicing or installing this product.

Always use the fuse amperage rating specified for this shower sump model.

Failure to do so could result in serious personal injury or fire hazards.

To prevent possible injury and water damage, shut off all water before servicing.

REQUIRED FOR INSTALLATION

• Fine-tooth hacksaw or

band saw

• File

• Drill and suitable drill bit

• Four #8 screws for

hold-down clamps

Optional:

• Attwood model 7615 switch or equivalent

Note:

Switch is recommended to allow the pump to be turned off in

an emergency

The following materials are needed if no sump pump mounting pad is in place:

• 1/2" (1.27) thick marine plywood

block large enough to mount

sump pump

• Hand-held roller

INSTALLATION INSTRUCTIONS

1. Determine location of sump system, making sure system is lower than the

shower drain. Ensure there is enough structure and room to accommo-

date the sump system before drilling.

Note:

For correct operation of the automatic float switch, the box should be

mounted level. If the box cannot be mounted level, the end without fittings

can be raised up to 1/2" from level.

Note:

Because sailboats tend to heel, install sump system parallel lengthwise

with the bow-to-stern line. Fitting end can face either fore or aft.

98-08

D.C. Amps

Max Fuse

Amperages

2.7

1.8

• Phillips screwdriver

• One hose clamp for each

hose used

• Wire connectors for

16-gauge wire

• See amperage in chart above

• Fiberglass—18 oz. mat or woven

roving

• Polyester resin and catalyst

2. For hook-up to multiple inlets/hose sizes, determine opening sizes needed

and saw ends off the correct fittings (sizes and cut locations are marked

on the fittings). File around the fitting inside diameter to remove burrs and

rough edges. Figure 1

Figure 1

•

Cover

Pump

•

Box

Inlets

•

Outlet

•

3. To install mounting pad:

Locate mounting pad area according to guidelines in Step 1.

4. Sand gelcoat or paint off the mounting surface to create an area that

is 3" wider than the mounting pad on each side.

Completely cover the mounting pad with fiberglass. Saturate the

fiberglass with resin, and press the fiberglass edges down against

the hull to adhere the pad in place. Roll out the fiberglass to remove

any uneven surfaces, air bubbles, or excess resin.

5. Place the box in desired location. Position the hold-down clamps (two

on each side) so the top of the clamps are between the two raised ribs.

Figure 2

Mark the screw hole locations and drill the pilot holes. Do not drill through

the hull!

Note:

If possible, pre-wire the sump system before fastening clamps down. See

wiring diagram. Figure 4

Figure 2

6. Connect 3/4" I.D. outlet hose from thru-hull connector to the outlet fitting.

Secure the connection with a hose clamp.

Note:

The outlet hose must rise smoothly from the fitting, up to the thru-hull.

Any downward dip will trap water and air inside the pump. Figure 3

Figure 3

For correct operation, outlet

hose must continually rise

above pump outlet to

prevent air-lock

7. Connect inlet hoses from the drains to the inlet fittings. Secure each

connection with a hose clamp.

Note:

The inlet hoses must rise smoothly from the fitting, up to their Drains.

Also, using a shower drain with a trap will not allow air to vent out of the

box, and the rising water will not activate the float switch.

If the hose cannot be routed upward, or a drain with trap is desired:

Vent the sump system box by removing the system cover and drilling a 1/

4" hole where indicated. File away any rough edges, and replace the

cover (position hole toward the box end with no fittings). See Figure 1

8. Fasten sump system in place with the four hold-down clamps and four screws.

Optional 1/4" Vent

Hole Location

•

Float Switch

Filter

•

Hold-Down Clamps

•

Inlet Hose(s)

Outlet Hose

•

Hose Clamp