Frequently Asked Questions
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The John Guest Speedfit 15mm Male to 12mm Female Stem Reducer is designed to connect a 15mm push-fit fitting to 12mm John Guest Speedfit or Whale semi-rigid pipe. It is ideal for adapting between 15mm plumbing systems and 12mm pipework used in caravans, motorhomes, campervans and boats.
Installation is quick and straightforward. Simply insert the 15mm stem into a compatible 15mm push-fit fitting, then push the 12mm semi-rigid pipe fully into the reducer. The push-fit connection creates a secure, leak-resistant seal without the need for tools, solvent or sealants.
Manufactured from durable, corrosion-resistant acetal, this genuine John Guest fitting incorporates stainless steel grip teeth and an internal O-ring to provide a reliable connection. It is fully demountable, allowing pipework to be disconnected quickly for servicing or maintenance.
This reducer connects a 15mm push-fit fitting to 12mm John Guest Speedfit or Whale semi-rigid pipe, making it ideal for adapting between different pipe sizes in fresh water systems.
Yes. It is suitable for 12mm John Guest Speedfit and 12mm Whale semi-rigid pipe.
Yes. The 15mm male stem is designed to push directly into a compatible 15mm push-fit fitting or connector.
No. The 12mm pipe simply pushes into the Speedfit connection. The threaded end should be installed using a suitable sealing washer or gasket where required by the application.
Can't find the answer you're looking for?
Give our technical team a call on 01271 611015 (Option 2) and we'll be happy to help.