Pipework Outlet, 4 alternatives | Johnson Hardware IB-412 R01

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Alternative 2:

Toilet above the waterline

You may use a 19 mm. (3/4”) non-return valve

•Run the inlet hose by the most direct route from the inlet seacock to the flushing pump inlet tail

•For your maximum convenience of use, install an in-line non- return valve next to the inlet seacock which will ensure that the pump stays primed in between usages.

•The toilet flushing pump will self-prime up to 1m (3’) above the outside water level. If there is any possibility that the toilet flushing pump inlet may be more that 1m (3’) above the actual waterline when the craft is underway, a non-return valve is to be installed next to the seacock to maintain the pump in a primed condition

Pipework – Outlet, 4 alternatives

Alternative 1:

Toilet below the waterline and discharging overboard

Fig. 1

Toilet below the waterline

You must use a 38mm (1 1/2”) Vented Loop fitting.

•Arrange the outlet hose, so that its highest point is at least 20 cm

(8”) above the waterline, and fit the Vented Loop at the highest point.

Alternative 2:

Toilet above the waterline and discharging overboard

Fig. 2

Toilet above the waterline

You may use a 38mm (1 1/2”) Vented Loop fitting.

•Run the outlet hose up from the discharge elbow, at least 30 cm

(12’) above the discharge elbow then fit a Vented Loop on top of the hose, ensuring in this way to keep some water in the base of the toilet without risk of it being siphoned away

Alternative 3:

Toilet waste discharging into holding tank, discharge elbow below top of holding tank at any time

You must use a 38 mm (1 1/2”) Vented Loop fitting

•If the discharge elbow is placed less than 20 cm (8”) below the top of the holding tank when the craft is at rest, or if there is any possibility that the discharge elbow may be below the top of the tank at any time, a vented loop must be fitted in the outlet pipe- work

•Place the outlet hose point at least 20cm (8”) above the highest level that the top of the tank may reach and install the Vented Loop fitting on this highest point

Alternative 4:

Toilet waste discharging into holding tank, discharge elbow always above top of the holding tank

You may use a 38mm (1 1/2”) Vented Loop fitting

•Run the inlet hose upwards from the discharge elbow, to form a loop at least 30 cm (12”) higher than the discharge elbow.

•By fitting a Vented Loop on top of the hose loop, you will ensure to keep some water in the base of the toilet without risk of it being siphoned away.

5. TESTING:

Refer to the operating instructions and follow the procedures for normal use.

In case the flushing pump is hard to prime, half-fill the bowl with fresh water