L-Series (Utility)

L2800, L3130, L3200, L3400, L3430, L3540, L3800, L39, L3940, L4240, L4300, L4330, L4400, L4600, L4630, L4740, L48, L5030, L5240, L5740.

M-Series

M4700, M4800, M4900, M5400, M5700, M59, M6800, M7040, M8200, M8540, M9000, M9540.

MX-Series

MX4700, MX4800, MX5000, MX5100, MX5200.

B-Series (Compact)

B21, B2100, B2400, B2410, B26, B2630, B2710, B2910, B3030, B3200, B3300, B7500, B7510, B7610, B7800, B8200, B9200.

Skid Steers

Bobcat 751, 753, 763, 773, S130, S150, S160, S175, S185, T190.

Excavators

KX41, KX71, KX91, KX121, KX161.

Generators

KJ series and SQ series industrial power units.

k

• Material : Heat-Treated Carbon Steel
• Outer Diameter (OD) : ~26.0 mm
• Inner Hole Diameter : ~10.5 mm (Tapered for collets)
• Compatibility : 7mm Valve Stems
• Finish : Black Oxide or Phosphate Coating (Corrosion resistance)
• Design : Single-spring tapered seat

15221-13332 Current Successor: The modern replacement found in current Kubota parts manuals.

15521-13330 Alternate Series: Often listed for the slightly larger “03” and “05” series engines.

15221-13333 Latest Update: Some regions use this suffix for Tier 4 engine service kits.

15221-13330 Aftermarket Code: Standard identifier for brands like Reliance, TVH, and Maxiforce