Handline Tip: 1-1/2" base thread x 1-1/2" outlet thread. Plain Tip: 1-1/2" inlet. Dual Stacked Tips: 1-1/2" inlet. Tiple Stacked Tips: 1-1/2" Inlet. Plain Deluge Tip: 2-1/2" Inlet. Quad Stacked Tips: 2-1/2" Inlet. Quad Stacked Tips: 2-1/2" Inlet