• Bump shifts
  • Clutch failure
  • Flare shifts
  • Harsh shifts
  • Inconsistent shift quality
  • Shift codes
  • Soft shifts


Wear at various OE end plugs allows critical circuit leakage, resulting in drivability concerns.


Prevent circuit leakage and restore normal operation by installing Sonnax drop-in O-ringed end plug kit.


O-Ringed End Plug Kit
Part No. 122892-15K

Fits Mazda applications only.

You need this if... View Instructions Find a Distributor

OE end plugs are designed to prevent critical pressure loss by capping the bore while also functioning as a spring or valve stop. Repetitive spring motion, valve impact and fluid pressure variations cause wear between the end plug and bore mating surface, allowing vital fluid to escape the circuit.

Wear at various OE end plugs in Jatco JF506E units allows critical circuit leakage of solenoid modulator, secondary regulator and line pressures. These pressure losses impair control of the clutches, resulting in various shift complaints and eventual failure.

Put an end to leaks, restore hydraulic integrity and renew shift operation by installing Sonnax O-ringed end plug kit 122892-15K.

  • Minimal end-plug-to-bore clearance with added O-ring for positive seal
  • Reduces or eliminates leakage in eroded OE bores
  • Kit contains all of the circuit-sealing end plugs required for the complete valve body
  • Drop-in Zip Valve™ parts install quickly and easily
Learn More About Zip Valve™ Drop-In Repairs
  • End Plug .314" dia. x .197" length
  • End Plug .314" dia. x .415" length
  • End Plug .393" dia.
  • End Plug .452" dia.
  • End Plugs (4) .472" dia.
  • End Plug .629" dia.
  • O-Rings (15) Assorted, 6 extra
  • JF506E O-Ringed End Plug Kit 122892-15K
  • JF506E O-Ringed End Plug Kit 122892-15K

You need this if...

End plug deterioration or bore wear is visually detected.