Botil duplex shoes and collars sizes 7 5/8" to 30" are furnished with heavy duty duplex connection, to provide greater liner carrying capacity. These heavy duty connection have 4" O.D. left hand threads and 3¼" I.D. seal bores, and are capable of carrying 100,000 lbs. With a minimum safety factor 2. special accessory product are available for use with this large Duplex Equipment.

The Model "BE" Tubing Seal Nipple Product No. Bl 443-13 has field proven Chevron Seals for positive sealing of the nipple in the seal bore. It features an expandable left hand latch mechanism, allow the nipple to be "stabbed" into the duplex connection, and when upstrain is applied the latch is expanded to provide full engagement in duplex assembly. The nipple is released by rotating to the right unscrewing the latch mechanism for duplex connection.

Left hand square thread subs Product No. Bl 430-31 with 4" O.D. left hand threads are also available for use with Large Duplex Equipment.