Abstract: A fuel dispenser catchment box has a metal casing with an outwardly extending flange for attaching a dispenser housing and an inwardly extending flange for supporting a non-metallic closure member to close the bottom thereof. The closure member is removable and has apertures and seals for entry into the casing of a fuel supply line and an auxiliary line. The seals contain any fuel spillage in the closure member and prevent contamination of the ground, while removal of the closure member enables inspection of the fuel supply line beneath the fuel dispenser catchment box when necessary. A support clamp stabilizes the fuel supply line and an attached shut-off valve.