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The Rola-Chem 521170 is a durable injection check valve used on pool/spa chemical feed systems to help ensure one-way flow into the plumbing line
avoid over-lubrication that can trap debris
raised spas
High Efficiency Performance: Robust 1
Turn off the pump and relieve system pressure before servicing
Swimline Super Deluxe 18' Round Above Ground Winter Pool Cover, 4' Overlap | PCO1422 Pool Lights The Rola-Chem 521170 is aSwimline Deluxe Winter Pool Cover 12 ft x 18 ft Oval Above Ground (PCO1422) The Swimline PCO1422 is a durable solid winter pool cover designed for 12' x 18' oval above ground pools. Built from scrim reinforced woven polyethylene, it helps keep leaves, dirt, and winter debris out of the water while the black underside helps limit sunlight penetration to reduce off season algae growth and make spring opening easier. Key Features Pool Fit: 12 ft x 18 ft
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