1.0″| 25mm Vented Billet Aluminum Screw Cap with Weld on Bung Coolant Fuel Oil Tank

Designed for superior durability and performance, this CNC billet aluminum weld-on flange with cap is the exact component we trust in our overflow tanks, reservoirs, windshield washer tanks, and other vented applications where the tank needs to breathe. After struggling to source high-quality parts, we partnered directly with a CNC machining company to create our own precision-machined neck and cap. Crafted from solid 6061 billet aluminum, this flange and cap set offers exceptional strength, corrosion resistance, and a professional anodized finish. Unlike lower-quality alternatives, our weld flanges are free from coatings, ensuring a clean and reliable weld every time. Key Features: Premium 6061 Billet Aluminum – Strong, lightweight, and corrosion-resistant. Precision CNC Machining – Ensures a perfect fit and high-quality finish. Raw Aluminum Finish – No coatings, making welding easy and reliable. Ideal for Non-Vented Applications – Designed for fuel tanks, expansion tanks, and more. Specifications: Brand: Straightboost Performance Cap Material: 6061 Aluminum Flange Material: 6061 Aluminum Cap Finish: Anodized Black Cap OD: 44mm | 1.73″ Weld-On Flange OD: 37mm | 1.45″ Weld-On Flange ID: 23mm | 0.90″ Required Hole Size for Weld Flange Step: 33mm |1.29″ Assembled Overall Height: 28mm | 1.10″ Assembled Overall Height without weld step: 24mm | 0.95″ Vent Hole Diameter: 1mm | 0.039in (can be drilled to a larger size) Thread: 1″-12 UNF – 2A Complete Assembly Weight: 2.4 oz (70g) What’s Included: 1x Weld-On Flange 1x Billet Cap 1x O-Ring Note: During welding, we strongly recommend installing the cap in the flange and applying a lubricant (such as motor oil) to the threads. This helps prevent thread distortion during the welding process. Perfect for custom fabrication, racing, and performance applications, this CNC Billet Aluminum Weld-On Flange with Cap is a high-quality, no-compromise solution for professionals and enthusiasts alike.