Note: Only fit for below solvent trap.
10 inch Solvent Trap Stainless Steel
10 Inch 7075 Aluminum Modular Solvent Trap

The use of the booster assembly allows your semi-auto device to properly cycle when the weight of a solvent cleaning tube is added to the end of your semi-auto device. Most semi-devices with a browning type action will require a booster to properly cycle.
Weight 3.8oz
Booster assembly includes piston
Booster threads are 1-3/16 x 24.(1.375x24)