Armaflex Self Seal Class O Insulation 20mm x 13mm

With a 20mm bore, this Armaflex Self Seal Class O Insulation has a 13mm wall and comes in 2m lengths. The tube is slit right along, and the seam carries adhesive tape, so you open it over the pipe, peel the backing and press it shut.

Which pipe this Armaflex self seal insulation fits

20mm is not a copper plumbing size. This one suits pipe of roughly 20mm outside diameter, such as 20mm MDPE or plastic, running through a cold loft, garage or void. Lagging 22mm copper? Ask for the 22mm bore instead, because a tube that is too tight pulls the seam open.

The 13mm wall gives better frost and condensation protection than the 9mm version for not much more bulk. So it is the one to pick for unheated spaces.

• Bore: 20mm
• Wall thickness: 13mm
• Length: 2m, collected from the counter

Leave the tape backing on until the tube sits on the pipe, and keep the seam faces clean. Seal the butt joints between lengths with Armaflex adhesive or tape so moisture cannot creep in. Other bores and walls are listed in our pipe insulation range.

Glasgow trade counter: 20mm x 13mm pipe lagging

Try Plumb Parts, 555 South Street, Glasgow G14 0QX. Staffed Mon-Fri 8am-5pm and Sat-Sun 8am-1pm. Online orders work too.

Specification

• Brand: Armaflex
• Range: Class O Self Seal
• Material: Closed cell elastomeric foam
• Connection: Pre-slit tube with self-adhesive seam
• Sizes: 20mm bore, 13mm wall, 2m long
• Standard or approval: Class O, as named
• Suitable for: Heating, hot and cold water pipework
• Pack quantity: One 2m tube

Common Questions

What pipe does a 20mm Armaflex bore fit?

Pipe of about 20mm outside diameter, such as 20mm MDPE. It is not for 22mm copper, which needs the 22mm bore.

Is Armaflex good on a cold MDPE main in a garage?

Yes, the closed cell foam resists moisture, and a 13mm wall gives decent frost cover in an unheated space.

Can Armaflex be left outside?

Outdoors the foam needs protecting from sunlight and weather, for example with a finish or cladding made for it.