The 4 in. Polyethylene Snap Wye Coupling snaps easily onto pipe for fast connections. The coupling is made of durable polyethylene and resists corrosion and abrasion. High-density polyethylene construction. Snaps easily onto pipe for fast connections. Designed to split runs of 4 in. single-wall corrugated polyethylene drainage tape. Resists corrosion and abrasion for durability.