Product Description V-Twin Mfg. Nitrate Exhaust Valve Features: 1/8 oversize The exhaust valves are made of 21-2N heat treated non-magnetic stainless steel Replaces OEM 18081-36 V-Twin Mfg. Nitrate Exhaust Valve For Harley FL EL 1938-1947 at RevZilla Browse all RevZilla deals $32.99 In Stock at RevZilla Price verified today Buy Now at RevZilla Secure checkout Easy returns or compare prices Amazon eBay Product Details Brand V-Twin Mfg. Size OS Condition New MPN 11-9644 V-Twin Mfg.