The Airsource Service Port Cap is the perfect solution for keeping your vehicle's air conditioning system running smoothly. This blue cap is built to withstand the rigors of automotive environments, ensuring a secure and airtight seal for the low side service port. This prevents any leakage of refrigerants or contaminants, helping to maintain optimal performance and extend the lifespan of your vehicle's air conditioning system. FleetPride is your First Click in Heavy Duty®.