Polyplumb Stiffeners

[Lincol]

Bought a Polyplumb 22mm Spigot Elbow (PB1022) today, I intend fitting the male section into another Polyplumb fitting. I normally use the black pipe stiffeners (PB6422) however they don’t fit into the male section of the spigot.
My question is simple is there a different stiffener type for the spigot fitting or is it not necessary to fit one at all ??.
Strangely many of the pictures on the inter web appear to show what appears to be a metal stiffener which is odd.
Advise would be appreciated

 

[OffshoreGas]

Are you sure it’s Polyplumb pipe?

I don’t do much plastic but think Hepworth pipe (Hep20?) pipe grey too.

No idea if they are compatible.

 

[ShaunCorbs]

Should come pre done / ready for fitting

 

[OffshoreGas]

@Lincol just re read that, as @ShaunCorbs says. You shouldn't need the inserts with fittings.

Sorry I read it as you were struggling to get fitting onto existing pipe.

 

[Stigster]

As already stated but just to confirm, no insert/stiffener needed in the male side of the fitting as it is already rigid enough without the extra insert support.