A direct OEM-style replacement fill cap for Lippert hydraulic slide-out system reservoirs. If your current cap is cracked, stripped, or missing, this bright yellow cap makes it easy to identify the fill point and maintain a proper seal on your hydraulic fluid reservoir -- keeping your slide-out system operating correctly and your fluid clean.
The hydraulic reservoir fill cap is a small but critical component. A damaged or missing cap allows moisture, dirt, and debris to contaminate your hydraulic fluid, which accelerates wear on the pump and seals throughout the slide-out system. Lippert part 157505 is a direct replacement designed to fit the reservoir neck on most Lippert hydraulic slide-out systems found in a wide range of Class A, Class C, and fifth-wheel RVs.
The yellow color is intentional -- it follows standard hydraulic system color-coding conventions so you can quickly locate the fill point during routine fluid checks and top-offs, even in low-light conditions like a dark basement compartment.
Designed to match original Lippert hydraulic reservoir specifications for a secure, leak-resistant seal.
High-visibility yellow finish makes the hydraulic fill point easy to locate during maintenance.
Weighs just 0.05 lbs -- minimal added weight with no compromise on durability for the application.
Backed by a limited 1-year manufacturer warranty from Lippert Components.
Lippert part 157505 is designed for use with most Lippert hydraulic slide-out system reservoirs. It is also cross-referenced as Winnebago part number 18223101702, making it a confirmed fit for Winnebago coaches equipped with Lippert hydraulic slide-out systems.
If you are unsure whether this cap fits your specific reservoir, confirm your hydraulic reservoir manufacturer (Lippert) and compare the reservoir neck diameter and thread pattern against your existing cap before installation.
Hydraulic slide-out systems rely on clean, uncontaminated fluid at the correct level to extend pump life and ensure smooth, consistent slide operation. During regular maintenance intervals, it is good practice to inspect the fill cap for cracks, stripped threads, or a degraded seal. A cap that no longer seats firmly should be replaced immediately to prevent fluid loss and contamination.