Comparison : Item # H5211-A-BU, API Certified Permanently Attached Petroleum Couplings
Item # H5212-A, API Certified Permanently Attached Petroleum Couplings
Item # H5221-A-BU, API Certified Permanently Attached Petroleum Couplings
Item # H5222-A, API Certified Permanently Attached Petroleum Couplings
Item # H5231-A-BU, API Certified Permanently Attached Petroleum Couplings