Achieve the precise sleeve height you need for large diameter firestop sleeves. Available to fit a wide variety of sleeve combinations, these 1 in. extensions are ideal for thicker floor slabs.

Features

• Comes in sizes for 8- to 12-in. HydroFlame large diameter sleeves
• Compatible with both firestop and hollow sleeves
• Two extensions create a 2 in. tall water dam 
• 2 in. x 2 in. Side tabs provide support for riser clamp isolation pads
• 1 in. High extension to be used on HF-M12 or HF-P12 device