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Cycolac 1-1/2 Inch In-line Socket Sight Glass Item: SP1072S
$27.47 & FREE Shipping on orders over $35.

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This sight glass connects in line with your current system on 1.5 inch pipe. Just install by cutting pipe and glueing into place. 
 
With sight glasses, you are able to determine when the filter is backwashed by the clarity of the water. Helps eliminate wasted backwash water.


ABS 2 Inch In-line Socket Sight Glass Item: #SP1074S