Westbrass 793516MOCP 5/16-Inch Tip-Toe Mechanism with Cover, Chrome Push down on the cap to close and slow the drain of water; push again to open For use with a tub shoe drain with 5/16 in. stem hole (consider 79338MOCP for 3/8 in. stem) Includes flat rubber sealing washer Classic and versatile polished chrome finish Removable plastic cap on tip-toe mechanism with 5/16" threaded end Push down on the cap to close and slow the drain of water; push again to open For use with a tub shoe drain with 5/16 in. stem hole (consider 79338MOCP for 3/8 in. stem) Includes flat rubber sealing washer Classic and versatile polished chrome finish Removable plastic cap on tip-toe mechanism with 5/16&#034; threaded end