
QuadBoss · Clearance
QuadBoss Polaris Sportsman 550 Thermostat
MPN 401394 · Store SKU qbs401394
Supplier stock checked 11/7/2026, 9:17:37 AM UTC. Adding a part does not reserve it.
Clearance and scratch-and-dent parts are final sale. No returns or refunds.
Shipping & returns ↗This policy does not limit rights required by law.Free standard shipping on eligible parts orders of $100 or more. Oversized and freight items excluded. Fitment, taxes, availability and final totals are confirmed before payment.
Product details
QuadBoss® Thermostats are a direct O.E. replacement that meets or exceeds factory specs. Installs and operates exactly like the factory unit. QuadBoss 401394 Engine Cooling Thermostat, OEM# 3090135
Manufacturer fitment & guides
Check 401394 against the manufacturer’s application information below.
A manufacturer application guide is not available for this listing. Request the exact application from JuiceBuilt before payment.
Part-specific notes
- Clearance item. All sales are final under the supplier clearance policy.