Cummins Service Products Catalog – Tool ST 426O’Ring Assembly Tool

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Engine Family: C & J, NH

These o’ring assembly tools are used to install the injector cup o’ring on older model injectors. These nylon adapters fit over the injector cup threads and prevent damage to the o’ring.

Part No. Description
ST 426 O’Ring Assembly Tool (C, J, V6-140/V8-185 (PTB & PTC))
ST 427  O’Ring Assembly Tool (N, NH, V12, V6-200/V8-265 V8-300/VT8-430 (PTB & PTC))
Last Modified:  30-Jul-2003