The Bulldog is manufactured from brass. Bulldog pitless adapters are certified under the standards of the Pitless Adapter Division of the Water Systems Council (PAS-l). Bulldog pitless adapters are available for well sizes 4", 5" and 6" I.D. and is for drop and discharge pipe sizes of 1 and 1-1/4 inches. Bulldog adapters conform to Water System Council PAS-97(04) Standards.