GMP Tools part 89061 is a duct clamp sized for 1.50 in SDR conduit, gripping the duct at the blower inlet during fiber optic cable blowing. SDR-rated conduit has a defined wall-to-diameter ratio, and this clamp is bored to match it so the seal holds without crushing the duct. Secure clamping stops pullback and pressure loss on long or high-volume shots through 1.5 in pipe. It pairs with the corresponding 1.50 in duct seal to complete the inlet setup on GMP cable blowers. Stocked by Millennium as part #526624.