American Standard Warranty Upgrade Kit (GSN Models)The American Standard Warranty Upgrade Kit (GSN Models) is a crucial component for ensuring the proper functioning of your plumbing system. This kit is designed for use with GSN models and is made from durable materials to withstand high pressure and temperature fluctuations. Material: High quality metal Pressure rating: Up to 150 psi Compatible with GSN models At Apex Supply Company we offer local pickup or delivery, and nationwide shipping.