RAM Mount Double U-Bolt Base w/D Size 2.25" Ball for Rails from 1" to 1.25" in Diameter [RAM-D-235U] Entertainment | Subwoofers Port(s): 1/2" Internal Pipe Threads

Port(s): 1/2" Internal Pipe Threads 1" External Hose Barb

Just connect your hoses

Ball Bearings: High compression strength carbon black Acetal

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RAM Mount Double U-Bolt Base w/D Size 2.25" Ball for Rails from 1" to 1.25" in Diameter [RAM-D-235U] Entertainment | Subwoofers Port(s): 1/2" Internal Pipe ThreadsDouble U Bolt Base w D Size 2. 25" Ball for Rails from 1" to 1. 25" in Diameter The RAM D 235U consists of a double u bolt base with 2. 25" diameter ball and two stainless steel u bolts. The double u bolt base will accommodate rails from 0. 75" to 1. 25" in diameter. HARDWARE INCLUDED (2) 1 4" 20 U Bolts for 1" 1. 25" Rails (4) 1 4" 20 Nylock Nuts (4) Rubber Caps CLAMP RANGE 1" 1. 25" diameter BALL SIZE D Size (2. 25") WEIGHT CAPACITY Standard Use: 6