The Gleco Trap HV Refill features an air-tight lid with threaded inlet and outlet extensions that reserve an air pocket inside. When the trap is full, remove the air-release plug to drain inlet and outlet plumbing into the bucket before disconnecting. Each Refill includes a heavy-duty container, all 1 1/2" PVC plumbing components to fit most sink configurations, and instructions. Bucket is 11"H. Add 6" from top of bucket to center of wall drain outlet for proper clearance.