Fuel Tank Cap For Toro GTS 150cc Lawn Mower Model# 21442 21321 21445

What It Is

This is a genuine OEM replacement fuel tank cap for Toro GTS 150cc lawn mowers, specifically engineered to seal the fuel tank, prevent leaks, and allow proper venting during operation. It fits models 21442, 21321, and 21445.

Fitment & Compatibility

• Exact models: Toro GTS 150cc models 21442, 21321, 21445 only. Verify your model number on the mower’s data plate (under seat or near engine).
• OEM vs aftermarket: This is a genuine Toro part (likely part number 108-479-03 or similar). Aftermarket caps may fit but often lack the correct venting or seal quality.
• Measurements: Cap diameter is approximately 1.5 inches (38mm) with a standard twist-on design. Measure your current cap opening to confirm—if it’s larger or smaller, this won’t fit.
• Deck size irrelevant: Cap compatibility depends only on fuel tank opening, not deck width (e.g., 22-inch deck models may or may not share the same cap).

Key Things to Know

• Venting critical: This cap includes a built-in vent. If yours is clogged, the engine may stall or run poorly after a few minutes. Replace if you suspect vent issues.
• Installation is simple: No tools needed. Just twist off old cap, clean threads, and hand-tighten new one until snug. Overtightening can crack the cap.
• Low rating note: 3.4 stars likely reflects fitment issues (buyers buying wrong part) or minor venting inconsistencies. For the correct model, it should seal well.
• Check for cracks: Old caps often develop hairline cracks from UV exposure. If you see fuel smell or drips, replace immediately.

Should You Buy It

If you own one of the three listed Toro GTS 150cc models and need a reliable, leak-free seal with proper venting, this OEM cap is a safe, direct replacement. For other Toro mowers or generic caps, look elsewhere—fitment is model-specific and aftermarket options may save you a few dollars but risk poor sealing.