1Leak Proof: Engine heater core bypass kit offers a reliable alternative to repair a faulty or leaking heater core, strict standard and high performance. 25/8in 3/4in Hose Fitting: The kit includes interchangeable 5/8in and 3/4in hose adapters, allowing for easy installation with the most common heater hoses. 3Durable Material: Heater core bypass kit is constructed with high strength aluminum and rubber, engine heater core bypass kit is durable and reliable. 4Optimum Performance: Heater hose connector kit meets or exceeds original Oem standards, delivering a dependable performance over time. 5Direct Replacement: You can easily swap out the old heater core with our kit without the need for complex modifications or professional assistance.