Automotive Connector Back Cover – 34951-1210, Waterproof Housing Rear Seal for Female Socket Cable Plug

Part number 34951-1210 is a Molex automotive connector back cover — the rear seal and secondary lock component for a specific Molex female socket connector housing. Molex part numbers in the XXXXX-XXXX format identify Molex-manufactured connector accessories. Back covers are critical for achieving IP67 sealing and secondary terminal retention in waterproof automotive connectors used in engine bay, underbody, and exterior applications.

Key Specifications

• Part Number: 34951-1210
• Manufacturer: Molex
• Component Type: Connector back cover / rear seal / secondary lock
• Material: PA66 nylon, flame retardant
• Function: IP67 rear seal + secondary terminal retention
• Application: Specific Molex female socket connector housing (verify compatibility)

Molex Connector Back Covers — Identification

Molex back covers are specific to individual connector housing part numbers. To verify compatibility:

• Cross-reference 34951-1210 in the Molex online catalog (molex.com) to identify the compatible connector housing part numbers
• The Molex catalog lists the back cover as an accessory to the specific connector housing
• Verify the housing part number on the original connector before ordering the back cover
• Back covers are not interchangeable between different Molex connector housings, even if they appear similar

Frequently Asked Questions

How do I install a Molex connector back cover?

After loading all terminals into the housing and verifying each is fully seated (pull-test each wire): align the back cover with the housing rear face, matching the orientation key. Press the back cover firmly onto the housing until it clicks into the locked position. Verify the back cover is fully seated — a partially installed back cover will not compress the wire seals correctly and will not achieve IP67. For Molex connectors with a lever-type back cover, engage the lever after pressing the cover onto the housing.

What happens if the back cover is missing or damaged?

Without the back cover: (1) the connector will not achieve IP67 sealing — water enters through the rear; (2) terminals may push back under cable pull forces; (3) the connector does not meet OEM specifications. Always replace a missing or damaged back cover before returning the connector to service. Operating a waterproof connector without its back cover in an outdoor or underbody location will cause terminal corrosion and connector failure within months.

Can I reuse a Molex back cover after removal?

Yes, if undamaged. Inspect for cracks, deformed locking tabs, and damaged sealing surfaces. A back cover that no longer clicks firmly into the locked position should be replaced. Molex back covers are designed for multiple installation cycles but have a finite locking tab life — replace if retention force is reduced.

Typical Applications

• Automotive repair: Replacing missing or damaged back covers on Molex waterproof connectors
• Harness manufacturing: Back covers for new Molex connector assemblies
• Commercial vehicles: Back cover replacement during connector repair
• Automotive workshops: Workshop stock for Molex connector accessories

Package Contents

1 piece — automotive connector back cover 34951-1210 (Molex). Compatible connector housing not included.