Shower Drain Extension2 IPS shower drain extensions are for use when additional height is required to overcome inconsistent concrete pour. Height extension is from 1 1 2 to 3 1 2. Choose between heavy duty brass construction, or a durable corrosion resistant marine grade aluminum. Features: 2 MIP x 2 FIP for 2 drain spuds Use when additional height is required to overcome inconsistent concrete pours Height extension from 1 1 2 to 3 1 2 Specifications: Aluminum Brass