OTTO Excavator Parts Ex400-5 6Rb1 Valve Guide 1117210016 111721-0016 1-11721001-6 For Isuzu OTTO Isuzu EX400-5 6RB1 Valve Guide 1117210016 – 100% genuine OEM-grade precision-machined valve guide for Isuzu 6RB1 engines. Bulk in-stock with fast global shipping, ideal for wholesale & agency partners. Superior wear resistance and airtight seal vs generic parts, cuts rework/returns, boosts resale margins. Stable cross-border B2B supply.