The Koshin 011618902 Coupling is a genuine, OEM 4-inch (100 mm) hose connector designed specifically for Koshin heavy-duty water pumps, such as the SEH-100X. Crafted from durable, corrosion-resistant die-cast aluminum, it provides a secure, airtight, and leak-free connection between the pump's inlet or outlet ports and your water hoses, ensuring optimal suction and maximum water delivery performance.