waste pipe sizes?????

[Sickboy]

Sorry if this question has been asked already but I am confused.

I have a selection of Floplast plastic waste pipes. I have some pipe with 43 mm printed on the side. I've measured it and it is 43 mm outside diameter. I also have some 32 mm pipe which I have measured as 32 mm INSIDE diameter. Why is one measured on the outside and one on the inside?

To make things more confusing, I have 32mm solvent fittings which fit the 32 mm pipe. For the 43 mm, I have 40 mm solvent fittings that fit.

Why is all this so inconsistent?

 

[John506]

All I can tell you is different brands of pipes tend to come in different sizes, maybe a way to get you to stick with their brand as it all fits together?

 

[Fluffster]

Unfortunately they make solvent weld, compresion and push fit pipes in different sizes to confuse us.
Generally abs pipe is solvent weld and compression/push fit is the more plastic softer pipe.
Solvent weld pipe accepts obviously solvent weld fittings along with compression fittings but not push fit.

Pete