Keep your Lippert Smart Jack tongue jack protected and trail-ready with these OEM-spec rubber manual override plugs. Designed to seal the crank access opening on top of the Lippert 643589 Smart Jack, this pair of replacement plugs keeps moisture, road grime, and debris out of the jack mechanism when the manual override is not in use.
The Lippert 643589 Smart Jack is a motorized tongue jack that includes a manual override crank port -- a small opening on the top of the jack housing that accepts a hand crank in the event of motor failure or power loss. When that override is not in use, the opening needs to be plugged to prevent water intrusion and dirt contamination that can damage internal components over time.
Lippert part 72-3405 is the correct OEM replacement set for those plugs. If your original plugs have cracked, gone missing, or hardened with age, this pair restores a proper seal and keeps your jack internals clean for the long haul.
Engineered specifically for the Lippert 643589 Smart Jack crank port. Drop-in fit, no modification needed.
Includes 2 rubber plugs per order -- one for immediate use and one to keep as a spare, or use both as needed.
Flexible rubber material maintains a snug, weather-resistant fit in the crank opening across a wide temperature range.
Backed by Lippert's limited 1-year manufacturer warranty for peace of mind on the road or at the campsite.
An unsealed override port is a direct path for water, mud, and insects into your Smart Jack motor housing. Replacing cracked or missing plugs is a simple, low-cost step that protects a much more expensive jack assembly. At only 0.07 lbs. for the pair, these are easy to keep a set on hand in your parts kit.
These plugs are designed to fit the Lippert 643589 Smart Jack tongue jack. If you are unsure whether your tongue jack is the 643589 model, check the label on the jack motor housing or the original purchase documentation for your trailer. Lippert Smart Jacks are commonly found on Forest River, Keystone, and other major brand travel trailers and fifth wheels.
The crank port these plugs seal is intended for emergency or manual operation only. Always remove the plug before inserting a manual override crank. Forcing a crank against a seated plug can damage the plug or the port opening. Store removed plugs in a secure spot while cranking manually.
Inspect your Smart Jack override plugs at the start of each season. Rubber can harden and crack from UV exposure and temperature cycling. Catching a failed plug early is far cheaper than addressing water damage to the jack motor or internal gearing. Keeping a spare pair in your RV toolkit is a smart habit for any full-timer or frequent traveler.