Our Standard Chain Knocker for the M12 FUEL™ High Speed Chain Snake delivers a wall-to-wall clean that can tackle grease and soft blockages. The standard chain knockers are best used in PVC or fragile pipes. These steel chain knockers feature durable construction to tackle tough clogs in 1-1/2” lines and stainless steel set screws for corrosion resistance. Additional accessories available for more efficient descaling and breaking up grease: 1-1/4” – 1-1/2” Carbide (48-53-3035), 2” Carbide (48-3-3036), Replacement Cable (48-53-2519), Grease Penetrating Head (48-53-3028).