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7750041-113 MAG Aerospace Drain O-Ring Safran OEM Seal

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7750041-113 MAG Aerospace Drain O-Ring Safran OEM Seal
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7750041-113 MAG Aerospace Drain O-Ring Safran OEM Seal

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7750041-113 – MAG Aerospace Industries OEM Aerospace Preformed O-Ring Packing

Available now on the Airparts.aero Marketplace.

The MAG Aerospace Industries (Monogram/Safran) 7750041-113 is a high-precision, flight-certified preformed O-ring packing specifically engineered for the Drain Assembly of aircraft potable water and waste systems. In the pressurized environment of a modern airframe, the drain assembly is a critical interface that must remain hermetically sealed to prevent fluid leakage, which can lead to "Blue Ice" formation or severe corrosion of the primary airframe structure.

As a "Preformed" packing, the 7750041-113 is manufactured to exacting tolerances that exceed standard industrial specifications. It is designed to provide a consistent radial squeeze within the drain manifold, ensuring a leak-proof seal despite the extreme thermal gradients and pressure differentials encountered during high-altitude flight. The elastomeric compound is specifically selected for its Resistance to Compression Set, ensuring the seal maintains its memory and effectiveness throughout its service life.

Key Features

  • Fluid & Chemical Resilience: Formulated to withstand constant exposure to potable water, waste-treatment chemicals, and aviation cleaning solvents without swelling or degrading.

  • High-Pressure Reliability: Engineered to maintain its structural integrity in vacuum-waste systems and pressurized water lines, preventing "Blow-by" or air ingestion.

  • Optimized Durometer: Features a calibrated hardness (Shore A) that allows for easy installation while providing enough rigidity to resist extrusion in high-pressure glands.

  • Precision Preformed Geometry: Complies with strict aerospace dimensional standards, ensuring a perfect "interference fit" with the Monogram/Safran drain assembly housing.

Technical Specifications

  • Part Number: 7750041-113

  • Manufacturer: MAG Aerospace Industries (Monogram/Safran)

  • Component Type: Preformed O-Ring Packing / Drain Seal

  • Material: High-performance Synthetic Elastomer (Nitrile or Ethylene Propylene per Monogram spec)

  • Size Code: -113 (referring to the aerospace standard cross-section and ID)

  • Inside Diameter (ID): 0.549 inches (13.94 mm)

  • Cross-Section (W): 0.103 inches (2.62 mm)

  • Operating Temperature: -65°F to +250°F (-54°C to +121°C)

  • Governing Specifications: AS568-113 / MS28775 equivalent

  • Certification: FAA-PMA / Safran OEM Original Equipment

Aircraft Compatibility

  • Boeing 737 Next Gen (600/700/800/900) and MAX: Primary seal for lavatory and galley drain assemblies.

  • Airbus A320 Family (A319/A320/A321): Utilized in potable water service panels and drain manifolds.

  • Boeing 757 / 767 / 777: Used in various Monogram water/waste system sub-assemblies.

  • Embraer E-Jets: Standard drainage packing for regional transport configurations.

  • Note: This packing is specific to the Monogram/Safran Drain Assembly architecture. Always cross-reference the Illustrated Parts Catalog (IPC) for the specific assembly part number.

Applications

  • Drain Valve Assemblies: Sealing the interface between the valve body and the airframe drain mast.

  • Potable Water Service Panels: Ensuring a dry connection during ground servicing operations.

  • Galley Drain Manifolds: Preventing grey-water leakage into the cabin floor and sub-structure.

Why Choose 7750041-113?

A failure in a drain assembly seal is more than a nuisance; moisture migration beneath the cabin floorboards can lead to Intergranular Corrosion and expensive structural repairs. Choosing the genuine OEM 7750041-113 ensures that the O-ring’s thermal expansion coefficient and chemical compatibility match the original engineering specifications of the Safran/Monogram system. Unlike "look-alike" hardware-store seals, this aerospace packing is tested for Explosive Decompression resistance, ensuring it won't fragment during rapid pressure changes, thereby maintaining the aircraft's dispatch reliability.

Note: The 7750041-113 is a precision elastomeric part. It should be stored in a cool, dark environment to prevent "Ozone Cracking." During installation, ensure the gland is free of debris and only use an approved lubricant (e.g., Parker Super O-Lube or similar as specified in the CMM). Never reuse an O-ring that has been compressed; always replace with a new 7750041-113 during assembly overhaul.

Documentation