Shocker 40K Square Gooseneck Stem & Wallace Coupler for 3" Ball - 40,000 lbs - Square 4.5" Straight Pin, Raw Steel – Square 4.5″ Straight Pin, Raw Steel

This heavy-duty replacement inner tube square gooseneck stem and Wallace gooseneck coupler is built for serious towing applications. Designed for 3" gooseneck hitch balls, it features a thick-wall adjustable inner square tube stem and a rugged cast steel Wallace goose coupler rated at 40,000 lbs. It’s a direct replacement for worn or damaged factory gooseneck stems and couplers, restoring strength, safety, and dependable performance to your trailer. Engineered for work-ready durability, this square stem and coupler assembly is ideal for flatbeds, dump trailers, livestock trailers, equipment haulers, race trailers, and more. The adjustable stem allows you to set proper trailer height, while the traditional Wallace coupler delivers a proven, secure connection for heavy loads. Designed to weld to your existing outer gooseneck tube for a solid, professional installation. Installs in minutes. California Residents: Prop 65 Warning

• 40,000 lbs. Rated Wallace Gooseneck Coupler: Heavy-duty cast steel coupler designed specifically for 3" gooseneck hitch balls, providing reliable, time-tested towing performance.
• Complete Replacement Square Stem & Wallace Goose Coupler for 3" Ball: Replaces your factory inner tube square stem and coupler as a single unit for a clean, strong upgrade or repair.
• Thick-Wall Square Tube Stem for Superior Strength: Built to handle extreme towing loads and demanding trailer applications without flex or fatigue.
• Extra Reinforced Plating at Weld Area for Long-Term Durability: Additional plating at the coupler-to-stem connection ensures a strong weld and long service life.
• 4 Adjustment Holes for the Height You Need: Features 4 adjustment holes spaced 2-3/4" apart, allowing precise trailer height adjustment. 3/4" diameter holes for 4" square stem and 1" diameter holes for 4.5" square stem.
• 4.5" Replacement Inner Square Gooseneck Tubes: Available in multiple inner tube sizes to match common square gooseneck trailer setups.
• 40,000 lbs. Towing Capacity / 8,000 lbs. Tongue Weight: Built for heavy-duty commercial and agricultural towing demands.
• Includes Inner Tube Square Stem & Wallace Forge Gooseneck Coupler: Includes complete replacement inner square tube gooseneck stem size selected & Wallace Forge coupler for 3" gooseneck ball.
• Raw Finish Options Available: Offered in raw steel for custom painting or coating.
• Designed for 3" Gooseneck Hitch Balls: Compatible with standard 3" gooseneck balls commonly used on high-capacity trailers.
• Optional Outer Gooseneck Square Sleeve Tube: Does not include weld on outer gooseneck square sleeve tube. They are sold separately.