American Granby PT800 Pitless Adapter Bronze 5"-8". American Granby PT800 is a Pitless Adapter that has a cast copper content alloy bronze construction. This construction insures great durability in any well condition and a long life. The adapter includes a drop pipe size of 1" and a casing hole opening of 1-3/4". The adapter fastens to the well casing to provide tapping for a well drain, bulkhead fittings, electrical conduit and other related uses.