The primary design function of the OE end plug in listed Toyota/Lexus units is to prevent critical pressure loss by capping the bore. OE end plugs rely entirely on small clearances between the end plug and bore to confine hydraulic fluid under fluctuating pressure. End plugs are often tasked with a secondary role functioning as a spring stop or valve stop.
The repetitious and varying actions of fluid pressure, spring motion and valve impact cause wear at the end plug and bore mating surface and can distort the shape of the end plug. High pressure fluid leaking through the clearance gap can, with time, erode the surface material of both end plug and bore. Eventually the cumulative loss of hydraulic integrity leads to low pressure in critical circuits. Complaints vary depending on the location of the worn end plug but are always related to pressure losses.
Sonnax O-ringed end plug kit 147741-30K replaces worn, distorted or eroded end plugs in Toyota/Lexus A760, A960 and AB60 series units. The Sonnax end plugs have small clearances to mechanically block the bore and increase effectiveness. The O-ring seal reduces leakage further by blocking off worn areas of the bore which the new end plug alone could not seal.

Minimal end plug-to-bore clearance with added O-ring for positive seal
Drop-in Zip Valve™ parts install quickly and easily


I.D.
Valve Name
End Plug Dia.
Installed Seal Position
O-Ring Size


Lower Body No. 1

A
4-5 Shift
11mm
Outboard
Medium

B
Inboard of SR Solenoid
12mm
Outboard
Medium

Lower Body No. 2

C
B1 Apply Relay
9mm
Inboard
Small

D
SL1 Relay
11mm
Inboard
Medium

E
Brake Control
12mm
Inboard
Medium

Upper Body No. 1

F
Lock-Up Relay
11mm
Inboard
Medium

G
1-2 Shift
11mm
Outboard
Medium

H
2-3 Shift
11mm
Outboard
Medium

I
3-4 Shift
11mm
Outboard
Medium

J
Reverse Sequence
11mm
Outboard
Medium

K
Clutch Control
12mm
Outboard
Medium

L
Clutch Apply Relay
11mm
Outboard
Medium

M
Secondary Regulator
14mm
Outboard
Large

Upper Body No. 2

N
C3 Apply Relay
11mm
Outboard
Medium


Learn More About Zip Valve™ Drop-In Repairs
The primary design function of the OE end plug in listed Toyota/Lexus units is to prevent critical pressure loss by capping the bore. OE end plugs rely entirely on small clearances between the end plug and bore to confine hydraulic fluid under fluctuating pressure. End plugs are often tasked with a secondary role functioning as a spring stop or valve stop.
The repetitious and varying actions of fluid pressure, spring motion and valve impact cause wear at the end plug and bore mating surface and can distort the shape of the end plug. High pressure fluid leaking through the clearance gap can, with time, erode the surface material of both end plug and bore. Eventually the cumulative loss of hydraulic integrity leads to low pressure in critical circuits. Complaints vary depending on the location of the worn end plug but are always related to pressure losses.
Sonnax O-ringed end plug kit 147741-30K replaces worn, distorted or eroded end plugs in Toyota/Lexus A760, A960 and AB60 series units. The Sonnax end plugs have small clearances to mechanically block the bore and increase effectiveness. The O-ring seal reduces leakage further by blocking off worn areas of the bore which the new end plug alone could not seal.

Minimal end plug-to-bore clearance with added O-ring for positive seal
Drop-in Zip Valve™ parts install quickly and easily


I.D.
Valve Name
End Plug Dia.
Installed Seal Position
O-Ring Size


Lower Body No. 1

A
4-5 Shift
11mm
Outboard
Medium

B
Inboard of SR Solenoid
12mm
Outboard
Medium

Lower Body No. 2

C
B1 Apply Relay
9mm
Inboard
Small

D
SL1 Relay
11mm
Inboard
Medium

E
Brake Control
12mm
Inboard
Medium

Upper Body No. 1

F
Lock-Up Relay
11mm
Inboard
Medium

G
1-2 Shift
11mm
Outboard
Medium

H
2-3 Shift
11mm
Outboard
Medium

I
3-4 Shift
11mm
Outboard
Medium

J
Reverse Sequence
11mm
Outboard
Medium

K
Clutch Control
12mm
Outboard
Medium

L
Clutch Apply Relay
11mm
Outboard
Medium

M
Secondary Regulator
14mm
Outboard
Large

Upper Body No. 2

N
C3 Apply Relay
11mm
Outboard
Medium


Learn More About Zip Valve™ Drop-In Repairs