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Gates 21729 Premium Molded Coolant Hose

(1989-1991 Chevrolet P30; 1989-1991 Chevrolet P30 Van; 1989-1991 GMC P3500)

Manufacturer

Picture for manufacturer Gates

Part Number

21729
7 reviews
Sale Price

$22.08

Estimated ship date Wednesday, November 25

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Product Details

The Gates 21729 Premium Molded Coolant Hose is a precision-engineered EPDM rubber coolant hose designed as a direct OEM-quality replacement for upper, lower, bypass, heater, and other coolant circuit applications. Pre-shaped to match factory hose routing, this molded hose installs quickly and seals reliably without modification.

Gates engineers this hose with an EPDM tube compound specifically formulated to resist electrochemical degradation (ECD) — the leading cause of coolant hose failure. ECD occurs when the hose, liquid coolant, and metal fittings interact to form a galvanic cell, creating micro-cracks in the hose wall that lead to leaks and roadside breakdowns. Gates' advanced material compound combats this process for extended service life.

Key Features:

  • EPDM construction — tube, synthetic fiber knit reinforcement, and heat- and ozone-resistant EPDM cover
  • Electrochemical degradation (ECD) resistance — engineered to fight the number one cause of hose failure
  • Vacuum collapse resistance — specially engineered materials reduce the need for internal support springs
  • Temperature rated from -40°F to +275°F (-40°C to +135°C)
  • Meets SAE 20R4 EC Class D1 industry specification
  • Pre-molded shape — fits precisely for a properly sealed, leak-free installation
  • Approved for marine applications
  • Part of Gates' comprehensive molded coolant hose replacement line

Gates recommends replacing hose clamps each time a new coolant hose is installed to ensure a secure, long-lasting seal. The Gates 21729 is a trusted aftermarket replacement that meets or exceeds original equipment specifications.

Products specifications

Fits

1989-1991 Chevrolet P30; 1989-1991 Chevrolet P30 Van; 1989-1991 GMC P3500

Centerline Length (in)

32.8

Centerline Length (mm)

833

Contains Spring

No

Inside Diameter 1 (in)

1.5

Inside Diameter 1 (mm)

38

Inside Diameter 2 (in)

1.75

Inside Diameter 2 (mm)

44

Number of Branches

0

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