Silicone Hose Coupler (Straight Reducer ). UNIVERSAL 4" to 3" silicone coupler Black. 1x 4" to 3" silicone coupler. Silicone + Polyester. 4-Ply Silicone + 3-Ply Polyester Reinforced. -65F to 500F. We will be happy to resolve any issues you may have in a cordial and friendly manner.
