Caliso 378K4 K-Section Poly V Serpentine Belt - 37.8in 4-Rib

The Caliso 378K4 is a K-Section Poly V serpentine belt (also known as a micro-rib belt) designed as a direct OEM-equivalent replacement for automotive accessory drive systems. With a 37.8-inch pitch length, 38.55-inch outside circumference, and 4 ribs, this belt meets the dimensional and performance specifications of the original equipment it replaces.

Key Features:

• Belt Type: K-Section Poly V (Micro-Rib) Serpentine Belt
• Pitch Length: 37.8 inches
• Outside Circumference: 38.55 inches
• Number of Ribs: 4
• Metric Cross-Reference: 4PK0960
• Material: Polyester cord construction with EPDM rubber compound
• Color: Black

The K-section micro-rib design provides excellent flexibility and precise belt-to-pulley contact, making it well-suited for compact accessory drive configurations. The polyester cord construction resists stretching and maintains consistent tension over the life of the belt. The EPDM rubber compound delivers superior heat and ozone resistance compared to traditional neoprene belts, extending service life in demanding engine bay conditions.

Cross-Reference Part Numbers:

• Dayco: K040378
• NAPA: 25-040378 / 25040378
• Goodyear: 4040378
• Bando: 4PK0960
• Metric: 4PK0960

The Caliso 378K4 serpentine belt is a dependable, OEM-specification replacement for worn or cracked poly V drive belts in automotive applications.