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Craftsman
Water Pump

Model # 3902521 Official Craftsman pump

Here are the diagrams and repair parts for Official Craftsman 3902521 pump, as well as links to manuals and error code tables, if available.

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Owner’s manual

Model diagram and schematic

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ALL PARTS
Showing 10 of 34 parts  |
Pump Housing O-ring (replaces U9-200) U9-399
#6

Pump only diagram

Pump housing o-ring (replaces u9-200)

Part #U9-399

This item is not returnable
$23.49 | 
18% OFF Phone Price : $28.49
In Stock
Hose Clamp U19-55SS
#5

Tank only diagram

Hose clamp

Part #U19-55SS

The manufacturer no longer makes this part, and there's no substitute part

Pump Body Gasket J20-18
#15

Pump only diagram

Pump body gasket

Part #J20-18

Replaced by #J20-18C

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Manufacturer substitution
This part replaces J20-18. Substitute parts can look different from the original.
This item is not returnable
$9.99 | 
9% OFF Phone Price : $10.99
In Stock
Captive Air Tank Inlet Flange (replaces U131-422p) U31-446P
#2

Tank only diagram

Captive air tank inlet flange (replaces u131-422p)

Part #U31-446P

$43.09 | 
10% OFF Phone Price : $48.09
In Stock
0-ring U9-226
#19

Pump only diagram

0-ring

Part #U9-226

$10.71
In Stock
Pump Impeller Housing Clamp C19-54SS
#10

Pump only diagram

Pump impeller housing clamp

Part #C19-54SS

$231.69 | 
$10.00 OFF Phone Price : $241.69
In Stock
Pump Pressure Switch Tube U37-673P
#17

Pump only diagram

Pump pressure switch tube

Part #U37-673P

This item is not returnable
$19.16 | 
10% OFF Was : $21.29
In Stock
Pump Check Valve (replaces N12-12p) N166-5P
#20

Pump only diagram

Pump check valve (replaces n12-12p)

Part #N166-5P

$123.89 | 
7% OFF Phone Price : $133.89
In Stock
Pump Impeller J105-40PE
#8

Pump only diagram

Pump impeller

Part #J105-40PE

$139.59 | 
7% OFF Phone Price : $149.59
In Stock
Pump Rear Body L176-47P
#5

Pump only diagram

Pump rear body

Part #L176-47P

$276.09 | 
$10.00 OFF Phone Price : $286.09
In Stock

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Read more
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Time required
 45 minutes or less

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