Comparison : Item # 4033004, 1" Series 400 Rotary Joint, 2-Passage, Stationary Syphon
Item # 4033006, 1.5" Series 400 Rotary Joint, 2-Passage, Stationary Syphon
Item # 4033008, 2" Series 400 Rotary Joint, 2-Passage, Stationary Syphon
Item # 4033010, 2.5" Series 400 Rotary Joint, 2-Passage, Stationary Syphon