Coupon Retention Pilot Drills, Drill Shafts, Spaid Insert Tips, and ... "40+ years of hot tap machine and line stop machine experience built into each hot tap machine with dependable coupon retention using our hot tapper." ... 406 Double Stainless Steel Straps and Fittings; ... (2- Coupon retainer wire holes - Flute length 1 3/4") Compatible with our LJ1-25, T1-2, T1-M and T1-4 Hot Tapping Machines ...