The Sioux Chief jackrabbit 2 inch brass compression jacking bolt shower drain with 4-1/4 inch. Strainer is ideal for replacement applications when work space is restricted. This drain has a brass body, locknut and pressure plate washer with elastomer no caulk gasket. Unique design uses stainless steel jacking bolts and a pressure plate washer to create a seal no need to wrench tighten the outer locknut.No-caulk shower module drain,Shower drain is perfect for replacement applications when work space is restricted,Compatible with PVC piping,Compression connection,4 jacking bolts tighten from the bottom to push upwards and seal,Locknut and pressure plate washer with elastomer no caulk gasket,Brass construction