+3 3/8" npt Bung TNK-EB-3 $25.00 In stock Quantity: 1 Add to Bag Product Details 1/4" npt Bung 5052 aluminum with 3/8" npt female thread. 7/8" OD with a 3/4" OD step. Good for outlets, vents and return lines. Save this product for later Favorite