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We are constructing a one room addition and will be adding a radiator to the existing two pipe system. I have posted some topics relative to this addition in the past and now the day is finally here for piping. There is a supply and return branch already tapped into the existing main and return that we will be piping from. The plumber is using VIEGA - 1 inch supply and 3/4 inch return. The location of radiator will be towards the end of one of the mains.
Other than making sure lines are pitched properly and they dont become low point in system should I have a tee with threaded plug installed in the return line in case I need to add a vent? My main vent is a gorton no.2 at boiler (just installed - will be first run this season). With the viega I will not be able add anything later on my own so that is why I ask if I should plan ahead with the threaded tee. Should it be close to the trap outlet or back towards the return main?