Gerni / Stihl M21 - M22 Adapter

Gerni / Stihl M21 to M22 Adapter – High-Pressure Washer Fitting

Easily Convert Your Gerni or Stihl M21 Outlet to a Standard M22 Connector

Need to connect standard M22 pressure washer accessories to your Gerni or Stihl high-pressure cleaner with an M21 outlet? This Gerni / Stihl M21–M22 Adapter is the perfect solution. Designed for secure, leak-free connection, this adapter converts the unique M21 thread (common in Gerni and Stihl models) to the widely used M22 (14mm ID) fitting.

✅ Key Features:

• Compatible with Gerni and Stihl M21 pressure washer outlets

• Converts to standard M22 14mm internal diameter fitting

• Durable, leak-resistant design for reliable performance

• Easy installation with proper technique (watch video below)

• Ideal for use with hoses, guns, and accessories requiring an M22 connector

⚠️ Installation Tips:

• Wear gloves or use a rag to protect your hands during installation

• Insert the O-ring fully into the M21 fitting

• Hold the threaded section firmly while turning the outer part clockwise

• Ensure the outer collar stays still—if it rotates, the internal fitting may unscrew

📽️ Need help? Watch the installation guide

📦 Package Includes:

• 1x Gerni / Stihl M21 to M22 Adapter