Apex describes the BigAl as a variable level, diaphragm activated, full flow valve used in large pump-fed water tanks or reservoirs, main or storage tanks, or as a control valve backup in rainwater harvesting. Watts lists it for irrigation, rainwater harvesting, agriculture, horticulture, livestock watering, farm and ranch, and hydroponic systems. A differential dual-weight system holds the valve shut through a wide level band, which reduces pump wear and saves electricity. Distributed in the US by Watts.

• Series: Apex BigAl (BA), model BA114
• Inlet connection size: 1-1/4"
• Body material: polyphenylene sulfide; built with fiberglass-reinforced nylon and acetal (POM)
• Maximum pressure: 175 PSI
• Inlet pressure: 2 PSI
• Maximum temperature: 140 deg F
• Lead free
• Diaphragm activated - full on/off with soft closing, no water hammer
• Adjustable weighted floats set the open and close levels
• UV stabilized
• Patented self-cleaning mechanism
• Serviceable - repair kit available
• Manufacturer part: 88005611

BigAl vs PumpBuddy: Both are Apex differential tank valves. The BigAl is the larger-bore series built for large tanks and reservoirs and runs from 1-1/4" up to 2"; the PumpBuddy series covers 3/4" through 1-1/4". The BigAl also opens at a lower inlet pressure - Watts lists 2 PSI against 8 PSI for the PumpBuddy.

Installation: Apex specifies a minimum 8" (200mm) head above the valve, and says to keep a 12" (300mm) head on the pump outlet at all times. Adjust the cord length for the minimum desired water level and the top (small) weight for the maximum level.

FOR CALIFORNIA SHOPPERS

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• ⚠  WARNING: This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. For more information: www.watts.com/prop65