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Symptoms: Various concerns depending on location of leaking end plug Pressure loss Cause: Worn, eroded end plugs allow loss of critical hydraulic pressure. Correction: These Sonnax O-ringed end plugs restore correct circuit pressures. The O-ring provides additional sealing to reduce hydraulic losses at critical circuits. Part No. 147741-30K •End Plug, 9mm •O-Rings, Small (2) 1 Extra •End Plugs, 11mm (10) •End Plugs, 12mm (2) •O-Rings, Medium (19) 7 extra •End Plug, 14mm •O-Rings, Large (2) 1 extra •Installation Screw The primary design function of the OE end plug 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. •No special tools required •Minimal end plug-to-bore clearance with added O-ring for positive seal