The Lainer Suspension Check Valve RSV MONO is a reservoir check valve for Showa mono shock applications with an M12 x 1.25 thread. It is used within the shock’s damping circuit to control oil flow during operation. This is a service and tuning component typically installed during a rebuild or setup change.

Inside the System

A reservoir check valve is used to direct oil flow through specific passages in the shock. In this application, it is described as separating compression from rebound by influencing where oil is routed during compression, while not affecting rebound adjustment.

Key Features

  • Reservoir check valve for mono shock systems
  • M12 x 1.25 thread size
  • Intended for Showa mono shock reservoir use

Adjustment & Setup

This check valve is supplied without a pre-drilled hole so it can be drilled to suit the desired setup. As noted, a smaller drilled hole increases firmness. Any drilling should be carried out carefully and consistently, as it directly changes the damping behaviour.

Compatibility

  • Showa mono shock systems
  • Thread size: M12 x 1.25

Serviceability

Replace a check valve when it is worn, damaged, contaminated, or when changing the internal configuration as part of shock servicing. It should not be replaced as a first step for general handling issues unless the shock is already being rebuilt and the internal condition/setup is being assessed.

Setup & Workshop Notes

Installation and any drilling operations are workshop-level tasks and should be performed by experienced suspension technicians. The original notes recommend use for professional or very experienced riders with aggressive riding, and cite Supermotard and Supercross as typical applications.

SKU CHECKV_12X125_SHOWA
Barcode # CHECKV12X125SHOWA
Brand Lainer Suspension
Shipping Weight 0.0500kg
Shipping Size 0.050 x 0.050 x 0.050m
See our Shipping Information See our Frequently Asked Questions
Thread Size M12 x 1.25

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