Examples of Installing Infield Fittings.
Grommets are installed by drilling a hole in the mother line and inserting a rubber ring into the hole which has a groove that fits into the sides of the pipe. The coupling is inserted into the lateral and then pushed into the rubber ring. There is also another type of grommet that is pushed into the hole and the retaining nut on the grommet is tightened.
Nylon couplings and reducers are pushed into the poly pipe with no clamps needed as long as the working pressure is within limits.
Micros have a tube that is fitted with a barb and drippers have the barb moulded onto them. A hole is punched into the poly pipe and the barb is inserted into the hole.