Moose Utility Division Radiator Cap 1903‑0027 – Small 13 PSI Cap for Polaris & Arctic Cat (1990–2021) – OEM‑Style Replacement

OVERVIEW

Replace a failing seal with the Moose Utility Division 1903‑0027, a direct-stopper engineered to restore stable cooling system pressure on Polaris ATVs and UTVs. Built around a stamped steel upper housing mated to a heavy-duty rubber lower gasket, this radiator cap eliminates slow weeping and boil-off while matching factory dimensional tolerances. Designed as a routine maintenance intervention, it ensures consistent thermal regulation across diverse trail and work operating conditions.

ENGINEERING & PERFORMANCE

The calibrated 13 PSI rating secures coolant inside the circuit, suppressing vapor locking and maintaining steady heat extraction during sustained loads. Automotive-grade stamped steel withstands rapid thermal expansion without structural fatigue, and the reinforced bottom seal delivers uniform contact pressure to block micro-leaks. As a strict OE-style direct replacement, it bolts onto factory coolant necks without machining or supplementary hardware. This uncomplicated design philosophy translates to reliable pressure retention, reduced overheating incidents, and prolonged service life for adjacent cooling components.

KEY FEATURES

• OEM-style replacement radiator cap
• 13 PSI pressure retention specification
• Stamped steel upper construction for thermal resilience
• Durable synthetic rubber bottom seal
• Automotive-quality materials rated for continuous heat cycling
• Direct-fit mounting with no fabrication required
• Broad platform compatibility across competing powersports brands
• Supersedes factory references 2511189, 1240466, 1240300, and 1240694

TECHNICAL SPECIFICATIONS

• Brand: Moose Utility Division
• Part Name: 1903‑0027 Radiator Cap
• Component Type: Radiator Cap
• Material: Stamped Steel / Rubber Seal
• Supported Years: 1990–2021
• Compatible Trims: Sportsman, Ranger, RZR, Scrambler, General, Ace, Wildcat, Prowler, Predator, Outlaw, Xplorer, Super Utility, Worker, Magnum, Big Boss, Trail Boss, Trail Blazer, and Xpress series

FITMENT

• Polaris Sportsman 450 H.O. 4x4 (2020–2021)
• Polaris Sportsman 570 EFI 4x4 (2020–2021)
• Polaris Sportsman 570 Premium (2020–2021)
• Polaris Scrambler XP 1000 S 4x4 (2020–2021)
• Polaris Ranger Crew XP 1000 EPS Premium 4x4 (2020–2021)
• Polaris Ranger XP 1000 EPS Premium 4x4 (2019–2021)
• Polaris Scrambler 850 H.O. 4x4 (2019–2021)
• Polaris Ranger XP 1000 EPS 4x4 (2018–2019)
• Polaris Ranger XP 1000 4x4 (2017–2020)
• Polaris Sportsman XP 1000 4x4 (2017–2020)
• Polaris RZR 570EPS 4x4 (2017–2019)
• Polaris Ranger Crew XP 1000 EPS 4x4 (2017–2019)
• Polaris Ace 500 4x4 (2017–2019)
• Polaris Ace 900 XC 4x4 (2017–2019)
• Polaris RZR XP Turbo EPS 4x4 (2016–2021)
• Polaris RZR S 1000 EPS 4x4 (2016–2021)
• Polaris General 1000 Deluxe EPS 4x4 (2016–2021)
• Polaris General 1000 EPS 4x4 (2016–2020)
• Polaris Ace 900 SP (2016)
• Polaris Sportsman Ace 325 4x4 (2016)
• Polaris Sportsman 850 4x4 (2015–2021)
• Polaris RZR S 900 4x4 (2015–2020)
• Polaris RZR 900 EPS 4x4 (2015–2019)
• Polaris Ace 570 SP (2015–2019)
• Polaris RZR 900 XC (2015–2019)
• Polaris Ace 570 4x4 (2015–2019)
• Arctic Cat Wildcat 1000 XT EPS 4x4 (2015–2016, 2021)
• Polaris Sportsman XP 1000 4x4 (2015–2016)
• Polaris RZR 570 Trail LE EPS 4x4 (2014–2020)
• Arctic Cat Wildcat 1000 X 4x4 (2014–2021)
• Polaris RZR XP 1000 4x4 (2014–2021)
• Polaris RZR 900 4x4 (2014–2020)
• Arctic Cat Wildcat 700 Trail 4x4 (2014–2017)
• Arctic Cat Prowler 500 4x4 (2014–2015)
• Polaris Ranger 570 Mid-Size EFI (2014)
• Polaris RZR 800 EPS LE (2014)
• Polaris Ranger 800 4x4 (2013–2019)
• Polaris Ranger XP 900 4x4 (2013–2015)
• Arctic Cat Wildcat 1000 4x4 (2013–2014)
• Polaris RZR 800 4x4 (2010–2014)
• Polaris Ranger 400 (2010–2013)
• Polaris Sportsman 550 EFI 4x4 (2010–2012)
• Arctic Cat 450 4x4 (2009–2017)
• Arctic Cat Prowler 1000 (2009–2015)
• Arctic Cat Prowler 550 (2009–2014)
• Arctic Cat 550 4x4 (2009–2011)
• Polaris Sportsman XP 850 (2009)
• Polaris Sportsman XP 550 EFI 4x4 (2007–2017)
• Arctic Cat Prowler 700 (2006–2017)
• Arctic Cat 700 4x4 (2006–2017)
• Arctic Cat Prowler 650 (2006–2017)
• Polaris Ranger 500 EFI 4x4 (2006–2010)
• Arctic Cat 500 4x4 (2006–2010)
• Polaris Outlaw 500 IRS 4x2 (2006–2007)
• Polaris Outlaw 500 4x4 (2006–2007)
• Polaris Outlaw 500 (2004–2012)
• Arctic Cat 650 4x4 (2003–2009)
• Polaris Predator 500 LE (2003–2007)
• Polaris Predator 500 (2003–2007)
• Polaris Predator 500 Cross Country (1999)
• Polaris Super Utility 455 Diesel 4x4 (1998–2005)
• Polaris Worker 500 (1998–2005)
• Polaris Magnum 500 4x4 (1998–2005)
• Arctic Cat 500 4x4 (1998–2002)
• Arctic Cat 400 4x4 (1998–2000)
• Polaris Ranger 500 6x6 (1998–2001)
• Polaris Big Boss 500 6x6 (1997–1999)
• Polaris Xplorer 500 (1997–1999)
• Polaris Sportsman 400 L 4x4 (1996–1999)
• Polaris Sportsman 500 (1996–1997)
• Polaris Trail Blazer 250 (1996–2002)
• Polaris Xpress 400 4x2 (1995–2002)
• Polaris Xpress 400 L 4x2 (1995–2002)
• Polaris Xpress 300 (1995–2002)
• Polaris Xpress 400 4x4 (1995–2002)
• Polaris Xplorer 400 (1995–1998)
• Polaris Magnum 425 4x4 (1995–2001)
• Polaris Magnum 425 4x2 (1995–1997)
• Polaris Magnum 425 6x6 (1995–1998)
• Polaris Big Boss 400 L 6x6 (1994–1999)
• Polaris Sport 400 (1994–1995)
• Polaris 400 L 4x2 (1994)
• Polaris 400 L 4x4 (1992–1993)
• Polaris Trail Boss 350 L 4x4 (1990–1993)
• Polaris Trail Boss 350 L 4x2 (1990–1991)

WHY RIDERS CHOOSE THIS

Operators prioritize this Moose Utility Division cap because it eliminates coolant loss without introducing calibration variables or complex installation steps. The combination of rigid stamped steel and a precisely cross-linked rubber diaphragm creates a pressure boundary that resists heat degradation and vibration-induced failure. By adhering to manufacturer pressure targets and original mounting geometry, it preserves optimal coolant turnover rates that protect cylinder heads and water pumps from thermal shock. When installed on compatible Polaris or Arctic Cat platforms, it delivers a trouble-free repair that supports consistent performance and extends time between major cooling system overhauls.