ERR1607 is the water outlet gasket for the coolant housing on Land Rover Defender engines, sealing the joint between the water outlet and the cylinder head or thermostat housing to prevent coolant leakage. A failed or compressed gasket at this location typically presents as a visible coolant weep or drip from the front of the engine, and can lead to gradual coolant loss and overheating if left unaddressed. Replacing this gasket whenever the water outlet or thermostat is disturbed is essential to maintaining a leak-free cooling system. Key Features Manufactured to OEM specification for correct sealing at the water outlet coolant housing Direct replacement - no trimming or modification required for fitment Matches original Land Rover part reference ERR1607 Replace simultaneously with the thermostat and thermostat housing O-ring or gasket where applicable to avoid repeat disassembly Vehicle Fitment Fits Land Rover Defender (1986–2006) with 2.5 Naturally Aspirated Diesel, 2.5 Petrol, 2.5 Turbo Diesel, and 200Tdi engines, at the water outlet coolant housing. Not sure about fitment? Feel free to get in touch at [email protected]