SDR21 Tennis Ball Barrel

This batch of SDR21 for Tennis Ball Barrels has some sunburn and surface scratching, so we painted them with Krylon Fusion in Safety Blue. SDR21 is the ideal inside diameter for tennis balls, requiring little force to push the balls in. The outside diameter is the same as Schedule 40 so the fittings are the same, only the Inside Diameter is different. SDR21 is rated for 200 psi no matter what size it is, the thickness is adjusted to the diameter for the same pressure rating regardless of pipe size.