Behringer SKSBX7350 SP Stacking Beta Clamp Kit, 3 in Pipe Size HD, Smooth Bore, 316 Stainless Steel, Santoprene Cushion, Heavy Duty 20026501 Ear Plugs Noise Reduction Rating Ear Plugs Noise Reduction Rating 33 dB Earplug Shape Bullet Insertion Method Roll Down Reusability Disposable Cord Options Corded Earplug Size M Earplug Material Foam Earplug Packaging Bulk Bag Wrapped Pairs Earplug Pair Pack Type Plastic Bag Electrically Insulated No Band Color Purple Series SparkPlugs(R) Cord Material Plastic Band Material Plastic Cord Color Purple Standards ANSI S3 Provides Sound and Vibration Isolation Maximum Operating Pressure 214 psi Expansion Distance 1 2 in Joint Material EPDM Bolt Hole Threading Unthreaded Maximum Operating Temperature 210 Degrees F Offset Distance 3 4 in Number of Bolt Holes 12 Maximum Off Center Angle 15 Degrees Connection Type Flanged Minimum Operating Temperature 14 Degrees F Expansion Joint Type Single Bulb Compression Distance 63 in Maximum Vacuum Pressure 10 in Hg @ 72F Flange Material Finish Zinc Plated Beta Clamp Load Capacity 75 lb