A direct OEM replacement fitting for Lippert hydraulic slide-out systems. When a leaking or damaged hydraulic line fitting is holding your slide-out down -- or keeping it from retracting -- this is the part that gets it moving again. Correct thread type and geometry matters in hydraulic systems, and this fitting is built to Lippert spec.
Lippert hydraulic slide-out systems operate under significant hydraulic pressure, and every fitting in the circuit has to seal correctly. The 113131 (Lippert cross-reference 6400-04-04) is a straight-body hydraulic fitting with a 1/4 in. Flare Male NPT on one end and a 1/4 in. Male NPT on the other -- designed to connect rigid or flexible hydraulic lines within the Lippert slide-out power unit or distribution block.
This is not a generic plumbing fitting. The Flare MNPT end seats against a corresponding flare seat, creating a metal-to-metal seal suited for hydraulic fluid service. Using the wrong fitting type -- such as a standard NPT compression or barb -- can result in leaks under pressure. Always match end types exactly when replacing hydraulic fittings.
Inline straight-body design routes hydraulic lines without bends or angle changes at the fitting, reducing stress on adjacent hose or tubing.
End 1 is a 1/4 in. Flare Male NPT for a metal-to-metal flare seat seal. End 2 is a standard 1/4 in. Male NPT for threaded port connections.
Sold under Lippert part number 113131, cross-referenced as 6400-04-04. Direct replacement with no modification required on qualifying systems.
Rated for hydraulic fluid service as used in Lippert electric-over-hydraulic and dedicated hydraulic slide-out power units.
Lippert hydraulic slide-out systems are found across a wide range of fifth wheels, travel trailers, and motorhomes. The hydraulic circuit connects the pump unit to one or more hydraulic cylinders that extend and retract the slide room. Fittings like the 113131 appear at the pump outlet, manifold ports, and inline connections along the hydraulic lines.
Common failure points that require this fitting include: hydraulic fluid seeping from a cracked or cross-threaded fitting body, a stripped NPT thread at a manifold port, or a fitting damaged during a hose replacement. Inspect all fittings when you have the hydraulic system open -- a fitting showing corrosion or weeping fluid at the thread should be replaced proactively.