REPLACEMENTKITS.COM Internal Valve Stem Seal 4-Pack — Viton OEM-fit for CH/CV small engines

REPLACEMENTKITS.COM Internal Valve Stem Seal (4 Pack) is a durable Viton replacement seal set engineered to restore proper valve stem sealing for a wide range of CH, CV, ECH and ECV engine models.

These four internal valve stem seals are made from high-quality Viton material and designed as direct-fit aftermarket replacements for numerous small-engine applications. Whether you’re doing routine engine maintenance, repairing a leak, or stocking parts for seasonal equipment, this compact kit gives you reliable seals that match OEM form and function for many Briggs-style model numbers.

Which engine models will these valve stem seals fit?

The seals are compatible with an extensive list of small-engine designations, covering many CH, CV, ECH and ECV families. They’re intended as like-for-like replacements for the listed model numbers so you can confidently swap them during routine valve service.

• Fits CH series: CH18, CH20, CH22, CH23, CH25, CH620–CH682, CH730–CH752, CH940–CH980.
• Fits CV series: CV620, CV640, CV680, CV682, CV724, CV730–CV752, CV940.
• Fits ECH/ECV variants: ECH630, ECH650, ECH680, ECH730, ECH740, ECH749, ECV630, ECV730, ECV740E, ECV980.
• Direct replacement part numbers: compatible with 12-032-02, 66 032 05-S, 24 032 05-S and Stens 055-006.

How durable and reliable are these seals compared with OEM parts?

Manufactured from durable Viton elastomer, these seals resist heat, oil and fuel exposure better than many generic rubber compounds. That improves long-term sealing performance under typical small-engine operating temperatures and fuel types.

• Viton construction for improved chemical and heat resistance.
• Designed to maintain sealing under typical engine oil and fuel exposure.
• Engineered for consistent fit to replace specified OEM part numbers directly.
• Sold in a 4-pack so you have spares for multiple valves or future service.

What do I need to know before installation?

These are internal valve stem seals intended for valve train service—installation requires disassembly of the cylinder head or valve springs depending on your engine. Use the correct tools and follow service manual torque and clearance specs for safe, effective replacement.

• Requires valve spring removal or recommended engine service procedures.
• Inspect valve guides and stems; replace or clean as needed before sealing.
• Use a suitable seal installation tool to avoid damage during press-in.
• Keep a spare seal from the 4-pack for an extra valve or future maintenance.

Who is this for: This 4-pack from REPLACEMENTKITS.COM is aimed at mechanics, lawn and garden technicians, and DIY owners who maintain small engines (walk-behinds, riding mowers, generators, pressure washers) and need a reliable, aftermarket internal valve stem seal replacement. If you want durable Viton seals that match common OEM numbers and provide dependable service life, this kit gives a cost-effective option with American-owned brand support.