UPC 53-50 is used with scrim core duct. Install clamp over scrim core duct. On the terminator, push scrim core duct over 2 in tube of terminator. Secure clamp using tool UPC-54. Make sure clamp is crimped as tight as possible to insure a good connection. Tuck insulation and jacket into tape ring of terminator and secure with tape. Installation on the 2 in duct connector is similar. The Unico System® Tubing Clamp, 2 in Capacity, For Use With: Sound Attenuator Duct