These small, cylindrical caps are designed to cover the charging ports of air conditioning systems. Made from durable wood, they feature engraved letters 'L' and 'H' on their tops, likely indicating 'Low' and 'High' pressure ports. These caps help prevent dust, debris, or moisture from entering the system's sensitive charging ports when not in use. Their compact size allows for easy storage and portability, making them a handy accessory for HVAC technicians and DIY enthusiasts alike. Simply screw them onto the appropriate ports to protect your AC unit during maintenance or transportation.