Sierra International 18-5852 Shrouded Relay for Select Four-Stroke Mercury/Mariner Outboard Engines Shrouded Relay for Select Four-Stroke Mercury/Mariner Outboard Engines Replaces: Mercury/Mariner 853292, 821509, 821509T1 Fits: Four-Stroke 45 HP Serial Range 0G231123 to 0G472132 and Four-Stroke 50 HP Serial Range 0G231123 to 0T178499 Sierra Part Number 18-5852 All Sierra parts qualify for and are covered under Sierra's Industry Leading Customer Satisfaction Warranty Before Ordering, Please Verify this is the Correct Part for your Application. For Assistance, Please Call Sierra's Tech Support at 1-877-663-8396