Mueller Insulator Boots for J.S. Popper Telecom Clips Insulator boots for J.S. Popper telecom clips made from durable PVC. Stock numbers 714-8424, 714-8427, 714-8421, 714-8430, 714-8433 and 714-8437 are 61mm in length and are suitable for use with JP-25182, JP-8099, JP-8783, JP-33699 and JP-33674 J. S. Popper Telecom clips. Stock number 714-8446 and 714-8449 are 45.7mm in length are suitable for use with J.S. Popper telecom clips that have a banana jack or threaded banana jack connections.