Heavy-Duty Sealing Washer 4377

Description

The Heavy-Duty Sealing Washer (Part #4377) is an OEM-grade bonded stat-seal washer designed for critical mobile air conditioning (A/C) block and manifold connections across commercial trucks and heavy-duty equipment.

Engineered with a durable elastomer inner sealing lip mechanically bonded to a rigid metal outer collar, it delivers a high-integrity barrier at block-fitting interfaces, compressor ports, and expansion valve connections subjected to severe chassis vibration and thermal cycling.

• Component Type: Bonded Stat-Seal Washer / Block Fitting Seal
• Seal Material: High-grade elastomeric / HNBR inner ring
• Retainer Material: Heavy-gauge zinc-plated / corrosion-resistant steel
• Refrigerant Compatibility: R-134a, R-1234yf, R-12
• Application:Heavy-duty A/C compressor manifolds, block fittings, and line junctions