Universal Drain Rod Rubber Plunger - 4" is a common drain rod attachment used to clear blockages in domestic drain and sewer pipes by creating pressure and suction. It has a universal fitting compatible with standard drain rods and a diameter of approximately 100mm (4 inches). 
Product Specifications
Size: 4 inches (100mm) diameter.
Fitting Type: Universal fitting; compatible with standard 3/4" drain rods.
Material: Heavy-duty, durable rubber with a metal threaded insert for attaching to the rod.
Function: Used for pushing water and debris through blocked drains by creating pressure, which helps to dislodge obstructions.
Application: Ideal for use in standard domestic 4-inch (110mm) soil pipes.
Usage Note: When in use, always rotate the drain rod in a clockwise direction to ensure the attachment does not unscrew itself from the rod.