The EasyPro bottom drain is designed for use with 4" PVC pipe for high flow applications! Our EasyPro bottom drain is roto molded for superior strength and durability! Unlike other bottom drains which have multiple legs around the outside (which debris can catch on!) this drain has a center leg which prevents plugging. Large dome top keeps fish and large debris from entering pipe. Price includes drain and fittings to connect to 4" pipe.