Comparison : Item # H5191-BU, Internally Expanded Permanent Couplings (Scovill Style)
Item # H5192, Internally Expanded Permanent Couplings (Scovill Style)
Item # H5212NST, Internally Expanded Permanent Couplings (Scovill Style)
Item # H5211-A-BU, Internally Expanded Permanent Couplings (Scovill Style)
Item # G5212, Internally Expanded Permanent Couplings (Scovill Style)