Product Description To avoid damaging carbon rims, valve stem nut is designed to release air from within carbon rims that may be breached from improper rim taping when inflating tubeless tires ENVE Composites Pressure Relief Valve Stem Nut Pair at N+1 Bikes Browse all N+1 Bikes deals $5.00 In Stock at N+1 Bikes Price verified 1d ago Buy Now at N+1 Bikes Secure checkout Easy returns or compare prices Amazon eBay Product Details Brand N+1 Bikes N+1 Bikes