The receiver/drier contains filter media to filter out solid particles from the refrigerant (such as wear metals from the compressor) and a desiccant to remove moisture from the refrigerant. Like any filter, the receiver/drier has a limited capacity to store the debris it traps. Replace the receiver/drier under any of 3 conditions: 1. Every time the compressor is replaced 2. Every time the system has been exposed to the atmosphere for more than 30 minutes 3. Yearly. Part Number: 60-1-0019 Canister Diameter: 4.0″ Canister Height: 5.375″ Inlet Fitting: #6 Female Outlet Fitting: #6 Male High Flow: No Pressure Relief or Safety: No Switch Port: No Mounting Position: Horizontal/In-Line Other: Sight Glass Interchange Numbers: 0264644-6 4379-RD588621P 47821526-198 70268464 ABP N83 319299 AL153705 RE214439 RE49169 RE576834 RDT740401