The W803 and W804 unit can be installed either vertically or horizontally. When installed it is important to ensure that the spigot end is the outflow end of the fitting.
The unit must be anchored with a metal clamp which should be located on top of the moulded locators round the body of the SRU, which then allows the pipe inserted into the collar to expand and contract.
The body of the SRU incorporates an ‘0’ring seal.