You should slide the nut on the pipe and after that place the compression ring. Next, all that is left is to slide the pipe directly into the fitting and make sure that the nut is tightened as required.
Can be installed with high density and low density PE pipes (from PE32 up to PE100)
Pipe and fittings shall be manufactured from virgid PP(polypropylene) compounds.
With an adequate combination of these fittings it is possible to design and pressure piping application of fluide with PE pipes
Referenced Standards:  EN ISO1587 ;  AS/NZS4129
Compression fittings are an excellent alternative to sweating two pipes together. 

Fields of application：
Piping networks for water treatment systems.
Piping networks for irrigation of gardening or farming.
Piping networks for underground water supply system of living areas or factories.

Main Products：

Hdpe is short for high density polyethylene, non-toxic, food grade plastic. Hdpe is a highly crystalline, non-polar thermoplastic resin with a milky white appearance that conforms to the characteristics of most domestic and industrial chemicals. Hdpe is divided into industrial grade hdpd, food grade hdpe and medical grade hdpe according to different purposes required.

Because hdpe has no moisture absorption and good water vapor resistance, it can be used for anti-acidizing packaging buckets, as well as drinking water pipes. It has good impact resistance at room temperature, even at minus 40 degrees Celsius. Hdpe can be used to make wire and cable, because it has good electrical properties, especially high dielectric strength of insulation.