Atlantic Water Gardens AWGCV30 - Manual (Page 3)

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For those applications with width restrictions, glue the pipe stub
directly into the check valve. Make sure to find the arrow marking
the direction of flow through the check valve. It should point up
and away from the pump. The rubber boot will go onto the elbow
directly (Figure 2). The elbow will run over top of the pump in this
installation. A male thread adapter and a pipe stub (not included)
will be needed to complete the connection to the pump. This set
up is recommended for the PS15000 Skimmer, PV1800 Vault with
Extension, and PV2300 Vault with Extension.
Figure 2.
Flow Direction
Indicator