Always use a Speedfit pipe insert when using Speedfit pipe. Two types of pipe inserts are available: Standard and Superseal. Both types of inserts are suitable for Speedfit hot and cold water and heating systems. However, when an installation requires using a compression fitting, a Standard insert must be used. To be used when connecting Speedfit pipe to a Speedfit fitting or connecting Speedfit pipe to a compression fitting. Note: inserts must be used on all Speedfit connections. Designed, manufactured and assembled in the UK by John Guest Speedfit.