PolyPlumb MDPE Polyfast Adaptor 20mm to 32mm

The Polyplumb MDPE Polyfast adaptor makes the change from blue MDPE supply pipe to copper in one fitting. It is the usual part where a new water main reaches the copper inside a house.

Sizes of Polyplumb MDPE Polyfast adaptor

The size pairs are copper first and MDPE second. So 15mm x 20mm joins 15mm copper to 20mm MDPE. The 22mm x 25mm suits many house supplies, and 28mm x 32mm suits larger properties. Polyfast fittings have a nut that tightens onto the pipe, rather than a Push-Fit collet.

• 15mm x 20mm and 15mm x 25mm
• 22mm x 25mm and 22mm x 32mm
• 28mm x 32mm
• Copper to MDPE, cold water

Fit a pipe stiffener or insert in the MDPE end, because the nut will crush the pipe otherwise. Copper does not need one. Cut both pipes square and clean, push each one fully into the body and tighten the nuts as the instructions say. Test under pressure and check for weeps before the cupboard is closed in.

Copper to MDPE parts in Glasgow

For Polyplumb stopcocks and couplers to go with this adaptor, browse MDPE and alkathene fittings.

Plumb Parts, 555 South Street, Glasgow G14 0QX, serves the counter Mon-Fri 8am-5pm and Sat-Sun 8am-1pm. The website takes orders too.

Specification

• Brand: Polyplumb
• Range: Polyfast
• Maker code: PB423222
• Connection: Nut tightened onto the pipe at each end
• Sizes: 15mm x 20mm, 15mm x 25mm, 22mm x 25mm, 22mm x 32mm and 28mm x 32mm
• Suitable for: Joining copper to blue MDPE cold water supply pipe

Common Questions

How do I read the Polyfast adaptor sizes?

The copper size comes first and the MDPE size second. So 22mm x 25mm joins 22mm copper to 25mm MDPE.

Does the MDPE end need a stiffener?

Yes, fit a pipe insert or stiffener in the MDPE so the nut cannot crush it. The copper end does not need one.

Can it be used underground?

Follow Polyplumb’s instructions for buried use. In most houses this adaptor sits indoors where the supply meets the copper.

Datasheets

• Polypipe Water Supply and Utilities (Polyfast/MDPE) Installation Guide (PDF)