Moose Utility Division 1903‑0028 Radiator Cap – 13 PSI Replacement for Polaris ATVs & UTVs

OVERVIEW

The Moose Utility Division 1903‑0028 radiator cap functions as a critical cooling system maintenance component designed to maintain stable hydraulic pressure and eliminate engine overheating risks. Constructed from automotive-grade stamped steel with a precision-cut rubber bottom seal, this unit delivers exact factory pressure ratings and leak-proof thermal regulation. It provides a direct bolt-on interface exclusively engineered for Polaris ATVs and UTVs requiring accurate coolant circulation control.

ENGINEERING & PERFORMANCE

This cap regulates internal cooling system pressure at a fixed 13 PSI rating, which stabilizes coolant boiling points and prevents vapor lock during extended throttle use, steep climbs, or heavy towing. The stamped steel shell provides superior impact resistance and consistent heat dissipation compared to polymer alternatives, while the molded rubber base forms a lasting vacuum-tight barrier against header hose mating surfaces. Designed as a direct OEM-style replacement, it integrates into Polaris cooling circuits without adapter fittings, pressure testing adjustments, or complex bleeding procedures.

KEY FEATURES

• 13 PSI pressure rating for consistent thermal management
• Stamped steel construction delivering maximum impact and heat resistance
• Rubber bottom seal engineered to block coolant evaporation and air intrusion
• Automotive-quality materials selected for prolonged exposure to moisture and trail debris
• Direct OEM-style replacement maintaining original design tolerances
• Cross-references Polaris OEM part numbers 1240044 and 1240508

TECHNICAL SPECIFICATIONS

• Brand: Moose Utility Division
• Part Name: 1903-0028 Radiator Cap
• Component Type: Radiator Cap
• Material: Stamped steel core with automotive-grade rubber seal
• Supported Years: 2000–2020 platform coverage
• Compatible Trims: Polaris Sportsman, Sportsman Touring, Sportsman Ace, Hawkeye, RZR, ATP, Magnum, Super Utility, Worker, and Xpedition series

• Polaris ATP 500 H.O. 4x4 (2004–2005)
• Polaris Hawkeye 300 4x2 (2011–2015)
• Polaris Hawkeye 300 4x4 (2011–2015)
• Polaris Magnum 500 4x4 (2000–2002)
• Polaris RZR 800 4x4 (2008–2011)
• Polaris Sportsman 325 ETX EFI 4x4 (2015)
• Polaris Sportsman 400 (2001–2004)
• Polaris Sportsman 400 H.O. 4x4 (2008–2013)
• Polaris Sportsman 450 (2006–2007)
• Polaris Sportsman 450 H.O. 4x4 (2016–2020)
• Polaris Sportsman 450 H.O. EPS 4x4 (2016–2020)
• Polaris Sportsman 500 (2000)
• Polaris Sportsman 570 EFI 4x4 (2014–2020)
• Polaris Sportsman 570 EPS 4x4 (2014–2020)
• Polaris Sportsman 600 Twin (2003–2005)
• Polaris Sportsman 700 Twin (2001–2004)
• Polaris Sportsman 800 EFI (2007–2014)
• Polaris Sportsman 800 Twin EFI (2005–2006)
• Polaris Sportsman Ace 325 4x4 (2014–2015)
• Polaris Sportsman Touring 570 4x4 (2014–2020)
• Polaris Sportsman Touring 570 EPS 4x4 (2015–2020)
• Polaris Super Utility 455 Diesel 4x4 (2000–2001)
• Polaris Worker 500 (2001)
• Polaris Xpedition 425 (2000–2002)

WHY RIDERS CHOOSE THIS

Technicians and riders trust this cap because it restores factory cooling efficiency without requiring custom fittings or pressure recalibration. The combination of stamped steel resilience and a precision rubber gasket guarantees that system pressure remains locked during aggressive trail use, high-load work hours, or continuous low-speed maneuvering. By preventing coolant boil-over and eliminating air entrainment, it directly reduces thermal cycling stress on cylinder heads, water pump seals, and heater cores while extending overhaul intervals. Engineered strictly around Polaris radiator neck dimensions and expansion tank geometries, this component drops into place cleanly and performs exactly as the original manufacturer specified.