Galvanized steel increaser/reducer transitions between 4" and 3" diameter single-wall vent pipe. Plain (no-crimp) ends on both sides provide installation flexibility - secure with sheet metal screws and seal with aluminum foil tape for airtight connections.

• Reduces/increases from 4" to 3" diameter
• 30 gauge galvanized steel
• No-crimp (plain) ends on both sides
• Hemmed collar edges for strength and snug fit
• For HVAC ductwork, furnace vent, and heating/cooling systems
• Fits standard single-wall galvanized vent pipe

Note: For gas and oil-fired appliance venting and HVAC ductwork only. Not for use with solid-fuel-burning appliances.