PV1800 Size: 18" x 18" x 24" Features: -Cut lines for pump discharge and pipe extensions.-Flat panels for custom plumbing applications.-Large opening for easy pump access.-Top Opening: 14".-Top Opening: 18". Specifications: -Max pump flow: 10,000 GPH with top opening: 14".-Max pump flow: 15,000 GPH with top opening: 18". Dimensions: -Dimensions: 18"W x 24"H.-Dimensions: 23"W x 30"H.