First cut your PVC pipe so it is longer and can be inserted a good 6 inches into the cast iron pipe without restricting any other flow in the system. Place the rubber union on the PVC Pipe and then insert the PVC pipe into the center of the cast iron pipe. Now tighten down the hose clamps to make the connection.Click to see full answer. Keeping this in consideration, how are cast iron drain pipes joined together?DWV or drain waste vent pipe. These cast iron pipes have a “bell” or “hub” on one end and the smaller end of another pipe fits into it. The “joint” is then packed with a product called oakum. Then topped off with molten lead to seal the joint and prevent movement and possible future leaks.Also Know, what is the advantage of cast iron pipe? The main advantage of cast iron pipe fittings are that they are indeed highly resistant to abrasion making them the ideal choice for anyone wanting to drain materials such as sand, dishwasher water and garbage disposal. Another benefit is that they are highly durable and practically indestructible. Also question is, can you mix plastic and metal plumbing? Making the connection between plastic pipes such as ABS or PVC and metal pipes such as copper or galvanized steel is very straightforward. The chemicals used in the manufacture of any of these pipes do not react with one another, so you don’t have the corrosion factor to worry about.Should I replace cast iron waste pipe?In residential use, cast-iron pipes should last 50-75 years. There are factors that can speed up deterioration, but the typical cast-iron sewer should reach this age before it needs replacing.
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