AC Filter Drier Install: Copper, a Torch and a Wet Rag

A tech in a backward trucker cap and hoodie brazes copper at an outdoor condenser with its top opened, a red rag draped over the coil to shield the aluminum fins from the flame.

Beside the house, another tech handles a pink refrigerant cylinder next to the unit. In the close-up, the torch flows filler onto a joint at the service valve, which is wrapped in a wet rag so the heat doesn't damage the valve. The filter drier is the small canister in the liquid line, the thinner of the two copper pipes.