AMT 4240-300-91 Viton Gasket Subgroup with Impeller Seal
The AMT 4240-300-91 is the genuine Viton gasket subgroup supplied with the impeller seal included, listed against AMT’s 315, 424, 425 and 426 series documentation. Including the impeller seal in a gasket kit is a sensible piece of packaging, because that seal lives in one of the least accessible places in the pump.
Think about the sequence of a rebuild. To reach the impeller seal you have to open the casing, and to open the casing you have to break the gasketed joints. So by the time the impeller seal is exposed, every gasket in the kit has already been disturbed and needs replacing anyway. Buying them separately means two orders and the near-certainty that one arrives after you have already put the pump back together.
Everything in the subgroup is Viton — the fluoroelastomer for solvents, fuels, oils, acids and elevated temperatures, all of which will swell and harden nitrile from the inside where you cannot see it happening. If your pump handles anything more demanding than clean water, this is the correct specification, and substituting cheaper compounds is an economy that reappears as a leak. Contents vary by model, so confirm the part number against your parts breakdown before ordering.
Key Features
- Genuine AMT (Gorman-Rupp) subgroup kit — gaskets and the impeller seal in one part number
- Viton (fluoroelastomer) throughout for solvents, fuels, oils, acids and higher temperatures
- Includes the impeller seal, which is only reachable once the gasketed joints are opened
- Everything the teardown exposes gets renewed in one go
- Listed for AMT 315, 424, 425 and 426 series pumps
Applications
- AMT 315 series pumps
- AMT 424 and 425 series pumps
- AMT 426 series pumps
- Chemical transfer, solvent and fuel service
- Marine, dockside, washdown and industrial pump service
Specifications
- Brand: AMT (Gorman-Rupp)
- Manufacturer Part Number: 4240-300-91
- Part Type: Gasket subgroup kit with impeller seal
- Material: Viton (fluoroelastomer)
- Pump Series: AMT 315, 424, 425, 426
- Condition: New
Not sure this is the right part? Send us a Picture of the pump plate on your pump and the CLR Marine team will confirm this is the right kit and what it covers before you order.
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