There are 2 different types of Fernco sleeves. The P3000-150 has a
smooth shield, the PNH-150 a crinkled shield. The first says it's
good for iron, plastic, and copper; the second for iron.

In answer to a question about P3000-150 at
[www.homedepot.com]

Q:is this a no hub coupling? Jan 30, 2023

A: Hello, Thank you for your interest in our products. The Proflex
line is not No Hub. You will want to go with the Fernco NH-150 |Jan
31, 2023 by Fernco Product Expert |Apr 12, 2023


I thought a hub was the separator in the middle - both have it.

No-hub refers to CI pipe with no hub on the end.

The 'hub' inside the rubber is actually a 'stop' which (theoretically) also provides a 'smooth integral bore'.

As per charlottepipe.com:

Quote

Intended for use with DWV systems, no-hub couplings are used to join cast iron soil pipe that does not have the traditional hub and spigot. They are normally installed using a torque wrench. Generally, they have more clamps and provide a greater band load than standard couplings.

Edited 1 times.

I looked at a PNH-150 the other day. It has
a hub/stop and I couldn't roll it back.
Can I use it to connect plastic to plastic
for a drain pipe?

of course..

What's the difference between the two?
T

The 'heavy' rubber one without the sleeve is rated for ground burial and is NOT approved for above ground use.

A no-hub coupling coupling used in a 'building' MUST be shielded.

that would be a good question for fernco. i don't know.

They're both shielded. Fernco makes a number
of different shielded couplings. They all have
different target materials. For all those
with smooth shields the difference must be
on the inside.