+3 DEF Fluid Filler Neck Fitting Bung For Flatbed or Service Body KB-DEFFNFB $37.95 In stock Quantity: 1 Add to Bag Product Details Great for building custom DEF Filler Necks on flat beds or service bodies 1.5" Ø Base Stainless Steel CNC Turned Fits with Gates PN#: 30003 or Ford DEF Cap Save this product for later Favorite