Description
KN30200-G – RELAY VALVE
PART NUMBER(S):
Fleet Products: KN30200-G | OE: KN30200, N4301BA
DESCRIPTION:
Model: KN30200 Emergency Relay Valve
Vehicles: Pre-FMVSS-121 trailers, converter dollies, exempt trailers
• Valve Type: Emergency relay valve (non-charging type)
• Service Inlet: 3/8" NPT
• Emergency Inlet: 3/8" NPT
• Delivery Ports: 4 × 3/8" NPT
• Auxiliary Reservoir Port: 1/2" NPT (Plugged)
• Crack Pressure: 3.0 PSI (New)
• Weight: Approx. 3 lbs
• Mounting: Standard bracket mount (bracket may or may not be included)
• System Function: Controls brake system pressure during emergency brake application; does not charge emergency line
• Unique Features:
– Non-charging type for exempt applications
– Cover may be rotated without affecting performance or warranty
– Reservoir port plugged for specific system setups
Applications:
Specifically engineered for older trailers and converter dollies that do not fall under current FMVSS-121 requirements. Designed for emergency relay functions where non-charging air valve logic is required. OEM fitment ensures seamless integration in exempt trailer air systems.
CROSS-REFERENCE(S):
KN30200, KN30200-G, KN30200G, 530781, 3217-KN30200, KN30200X, N4301BA
A cross-reference listing means this part may be a compatible replacement for these part numbers based on OEM or distributor data.
IMPORTANT INSTALLATION NOTES:
✔ Mounts using standard relay valve bracket (check if bracket is included)
✔ Auxiliary reservoir port is plugged—do not attempt to use unless system requires it
✔ Suitable only for exempt trailer types
✔ Do not substitute in modern brake systems requiring charging/emergency line integration
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Warranty Information
