SeaStar - Bleeder Tee Fittings for Non-3 Helms/Cylinders - 2 Pack - HF5518 3/8" Dia. Tee Fittings for Non-3 Helms/Cylinders, Pair by SeaStar Solutions. This product is made of high-quality materials to serve you for years to come. Designed using state-of-the-art technology and with customers in mind. It will meet your needs and deliver great quality at an affordable cost. Features: All SeaStar manual hydraulic steering systems utilize the same style of fittings for all applications These are 3/8" compression fittings that utilize a 9/16"-24 extra fine thread Carefully crafted to suit your specific boating needs Engineered to high standards High-grade design delivers an extended lifespan.