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| Slightly recessed |
This flush fill cap has skinny "fingers". Installation slightly below sidewalk level keeps this oil tank cap from being tread upon by wayward soles. That allows the non-ferrous metal to acquire a slight patina.
Fill cap keys are used to screw and unscrew these caps. These keys come in different styles, typically two way or six way. The two way usually fits only specific fill cap models. A six way key may fit up to ninety percent of the caps it encounters.
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