Jumping Jack Tamping Rammer, 15kN, 4HP. T-TR-15. $3,715.98. Good price tamping rammers (jumping jack tampers) on Tool store for sales, powerful construction tools ideal for compacting sands, granular soils, mixed soils, gravel, and crushed aggregate in narrow or enclosed areas. Rammers come in 10kN to 14kN different impact force, 5/5.5/6 ...