IS-AirGaps
Air Gap Installation Instructions
Series 994 and 994RPDA Air Gaps
Sizes: 2
1
⁄
2
" – 10" (65 – 250mm)
1. Remove L shape bracket from one side of air gap drain.
2. Remove screw from one side of the splash guard.
3. Slide one half of the splash guard into the groove on the relief
valve body.
4. Slide the other half of the splash guard into the groove on the
relief valve body and reassemble the two parts together.
5. Reattach the L shape brackets long side up into slots in the
splash guard with screws.
6. Push as much of the sensing hose as possible into the air
gap drain funnel to prevent over spray.
Series 957 and 957RPDA Air Gaps
Sizes: 2
1
⁄
2
" – 10" (65 – 250mm)
Watts Air Gap Drains are designed to collect water that is being discharged by the relief valve, due to
minor check valve fouling and/or line pressure fluctuations.
Note: Air Gap Drains are not designed to collect the full discharge capacity of the relief valve.
Horizontal
1. Remove two of the relief valve capscrews 180° apart.
2. Remove the relief valve hose from fitting below inlet ball valve.
3. From the top of the air gap, thread the relief valve hose down
and out the slot.
4. Use
1
⁄
4
: - 20 UNC x 1" long stainless steel screws.
5. Reconnect relief valve hose to the fitting below the inlet ball
valve (Fig. 1).
Vertical
1. Detach the sensing line from the inlet ball valve and the elbow
on the relief valve.
2. Remove the elbows from the relief valve base.
3. Hang the Air Gap Drain on the body of the relief valve (Fig. 2).
4. Reinstall the elbow into the base of the relief valve to hold the
Air Gap Drain in place.
5. Install the rigid fitting end of the sensing line to the elbow on
the base of the relief valve and the swivel end to the fitting on
the ball valve.
Fig. 1
Splash Guard
Air Gap Drain Funnel
Fig. 2
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