MS21914-8W Cap is a military standard protective cap designed for use in aircraft fluid, pneumatic, hydraulic, fuel, and lubrication systems. It is intended to protect ports, fittings, and tube ends from contamination, moisture, and mechanical damage during storage, transportation, maintenance, or temporary system disassembly.

Manufactured in accordance with the MS21914 specification, this cap provides a secure protective cover that helps prevent the ingress of dust, dirt, foreign object debris (FOD), and other contaminants that could compromise system performance or component reliability. Proper use of protective caps is essential for preserving the cleanliness of critical aircraft systems and supporting maintenance best practices.

The MS21914-8W cap is suitable for use on compatible fittings and connection points throughout the aircraft. It is commonly used during component replacement, system servicing, and storage to help maintain the integrity of hydraulic, fuel, pneumatic, and lubrication circuits until final assembly or reinstallation.

Protective caps should be inspected before use to ensure they are free from damage or contamination and should be replaced if they no longer provide a secure fit or adequate protection.

Key Features

- Part Number: MS21914-8W
- Manufacturer: Military Standard (MS) / Approved Aviation Hardware Manufacturer
- Component: Protective Cap
- Designed to protect aircraft fittings, ports, and tube ends from contamination and damage
- Helps prevent the ingress of dust, moisture, and foreign object debris (FOD)
- Suitable for hydraulic, fuel, pneumatic, and lubrication system applications
- Manufactured to MS21914 military specification
- Ideal for aircraft maintenance, storage, transportation, and overhaul operations