|Description||Tube OD||Part No.|
|MS28778 Tube Fitting Boss Gasket||5/8||MS28778-10|
|Straight-thread tube fitting boss gaskets are used to provide a seal between straight-thread fittings, such as AN815, and ports of instruments with female straight threads instead of the more common female tapered pipe threads.|
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It is closer to 1". The 3/4 is in reference to what size AN fitting it is used with. An AN815-12 for example is a 3/4 fitting but measures almost an inch in diameter.