Merchant steel fittings are designed with Dryseal Taper Threads (NPTF) for more critical applications where the sealing compound may fail due to high heat or pressure, NPTF Dryseal threads produce a mechanical seal by the mating and slight crushing of the threads when a wrench is applied to tighten the fittings.
25 Whaley Avenue
P.O. Box 310
N0K 1M0 Canada
Boshart Industries LLC
3601 Woodpark Blvd. Charlotte, NC 2820 USA