See part A-4 in the diagram

Nut - Hex 1/4 - 20 81172B

Works with your model AP320D!

$11.15

Works with your model AP320D!

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This part works with the following brands:

This part works with the following products:

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This part works with the following models:

ERP Number: ERP10016606
Manufacturer Part Number: 81172B

Brand	Model Number	Description
Homelite	AP2151	Lawn Mower - Pump 1 1/2 In
Homelite	AP2151A	Lawn Mower - Pump 1 1/2 In
Homelite	AP2201	Water Pump - Ap2201 Pump 2" Ut-01517 01517-Ut Ap2201 Pump 2" Ut-01517 Ap2201 Pump 2"
Homelite	AP2201A	Lawn Mower - Pump 2 In
Homelite	AP2201B	Water Pump - Pump 2 In
Homelite	AP2202A	Water Pump - Pump 2 In
Homelite	AP3151	Lawn Mower - Pump 1 1/2 In
Homelite	AP3151A	Water Pump - Ap3151a Pump 1 1/2" Ut-01550 01550-Ut Ap3151a Pump 1 1/2" Ut-01550 Ap3151a Pump 1 1/2"
Homelite	AP320-1	Water Pump - Pump
Homelite	AP320-1A	Water Pump - Pump
Homelite	AP320-1B	Water Pump - Pump
Homelite	AP3201	Lawn Mower - Pump 2 In
Homelite	AP3201A	Lawn Mower - Pump 2 In
Homelite	AP3201B	Lawn Mower - Pump 2 In
Homelite	AP320D	Water Pump - Pump 2 In
Homelite	AP520	Water Pump - Pump 2 In