Our sucker rod couplings are up to API Spec 11B standard, including class SM coupling, class T coupling, Sub coupling, Full Size coupling, Slim Hole coupling, are availbale in 5/8", 3/4", 7/8", 1" and 1 1/8". Manufactured with high quality Carbon steel... More
Yunsheng Petroleum Machine Accessories Co.,Ltd
Main Products: Sucker Rod Joint... More