Classic Pipes Fluid Pipe Variants and Their Crafting Recipes
Fluid pipe variants in Classic Pipes let you move liquids through your builds, and every one of them is made by combining a base pipe with honeycomb. There are six fluid pipes available: 
Oak Wooden Fluid Pipe, 
Copper Fluid Pipe, 
Iron Fluid Pipe, 
Diamond Fluid Pipe, 
Obsidian Fluid Pipe, and 
Brick Fluid Pipe. Each has two separate crafting recipes, so you can either build one from raw materials or convert existing pipes in bulk.
The Two Crafting Routes
Every fluid pipe follows the same pattern. The first recipe uses raw materials plus glass and honeycomb to produce a single fluid pipe. The second recipe takes eight of the matching base pipe and adds honeycomb, converting a full batch at once. This means honeycomb is the one ingredient shared by all twelve recipes.
The bulk route is the more efficient option once you already have pipes placed or stockpiled. The raw material route is useful when you are starting fresh and have no base pipes on hand.
Oak Wooden Fluid Pipe
The Oak Wooden Fluid Pipe is crafted from two Oak Planks, one Glass, and one Honeycomb. Alternatively, combine eight 
Oak Wooden Pipe with one Honeycomb to get the fluid version.
Copper Fluid Pipe
The Copper Fluid Pipe is crafted from two Copper Ingots, one Glass, and one Honeycomb. Alternatively, combine eight 
Copper Pipe with one Honeycomb.
Iron Fluid Pipe
The Iron Fluid Pipe is crafted from two Iron Ingots, one Glass, and one Honeycomb. Alternatively, combine eight 
Iron Pipe with one Honeycomb.
Diamond Fluid Pipe
The Diamond Fluid Pipe is crafted from two Diamonds, one Glass, and one Honeycomb. Alternatively, combine eight 
Diamond Pipe with one Honeycomb.
Obsidian Fluid Pipe
The Obsidian Fluid Pipe is crafted from two Obsidian, one Glass, and one Honeycomb. Alternatively, combine eight 
Obsidian Pipe with one Honeycomb.
Brick Fluid Pipe
The Brick Fluid Pipe is crafted from two Bricks, one Glass, and one Honeycomb. Alternatively, combine eight 
Brick Pipe with one Honeycomb.
Choosing Between Recipes
Use the raw material recipe when you need a single fluid pipe and have no base pipes ready. Use the eight-pipe recipe when you already have a stock of base pipes and want to upgrade them in one step. Both recipes are shaped, so arrange the ingredients according to the recipe layout in your crafting grid.
Because honeycomb appears in every recipe, keeping a supply on hand is worthwhile before you start crafting fluid pipes in any quantity. The base pipe you convert determines which fluid variant you receive, so match the pipe type to the fluid pipe you want.
Covers the mod’s in-game guide topics: Oak Wooden Fluid Pipe Copper Fluid Pipe Iron Fluid Pipe Diamond Fluid Pipe Obsidian Fluid Pipe Brick Fluid Pipe