Choose durable HDPE sprinkler coupler from trusted manufacturers. ADM Engg offers high-quality, leak-proof solutions for efficient irrigation systems. An HDPE Sprinkler Coupler is a connecting component used in sprinkler irrigation systems to join pipes securely. These couplers are typically made from High-Density Polyethylene (HDPE), which is known for its strength, flexibility, and resistance to corrosion.