• Clamping ring bolts down into compression fit mounting ring. • Stainless steel screw fastens die-cast aluminum strainer. • No vertical studs to interfere with membrane. • Lower clamping ring mount is embedded in the drain bowl. No bolts penetrating drain body. • Cast aluminum strainer. • All fasteners are stainless steel. • Listed to meet Canadian and U.S. standards by QAI. Meets CSA B79 and ASME A112.6.4. • For complete seal assurance this product works best when used with Menzies Blue Drain Seal. • Also available as No Hub outlet model. • Also available in TPO Direct Weld™. • Longer pipes available.