Let's start by saying that 95% of all SmartVac II applications DO NOT REQUIRE this trap. Use this vacuum trap to catch excess coolant and swarf that may accumulate during long cycle times of 3+ hours or shorter cycles with rough part surfaces like casting. This trap is mounted inline between the vacuum chuck and VCU. The product includes a mounting bracket, cylinder wrench and fittings. Please note that it increases the startup time it takes to draw full vacuum by about 1 minute.