HARCO 80088 1.5" Ductile Iron IPS Swivel Joint Lateral Connection Lateral 90° The HARCO Lateral 90° is designed to connect irrigation laterals to mainlines and provide a change in elevation while providing a convenient connection for you NPT isolation valve. High-strength ductile iron eliminates the aggravation and expense associated with repairing pipe and fittings that break at this highstress area in golf and commercial irrigation systems.