4301651 Lincoln Flashguard Flashback Arrestors Regulator Type (Pair) 88-5SFBR.  Prevents reverse flow of gases with built-in check valves. Extinguishes flashback fire with stainless steel sintered element. 9/16½ – 18 connections.

Warning: This product may expose you to chemicals including lead which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov