Steel cup pigs have a sturdy carbon steel body with easily replaceable polyurethane cups. They are used for standard pigging such as filling and dewatering during hydrostatic testing, routine batching, and product removal. With a gauging plate they prove pipe roundness, check for excessive weld penetration or debris, and confirm minimum bend radius before intelligent pig runs. Sizes 2 in–6 in are center-rod type and 8 in and above use a bolting pattern (6 in–14 in offer either).