42001-0061S Air Flow Switch for MasterTemp & Max-E-Therm Pool Heaters | Pentair

42001-0061S Air Flow Switch for MasterTemp & Max-E-Therm Pool Heaters | Pentair

Marsoni

M251S

$159.99

Get it in 3 business days with 1 day shipping. Friday, May 29

42001-0061S Air Flow Switch for MasterTemp & Max-E-Therm Pool Heaters | PentairThe genuine OEM Pentair Air Flow Switch (42001 0061S) is the safety sensor that confirms adequate combustion air is reaching the burner before allowing ignition. It monitors the pressure differential across the air metering orifice; once airflow reaches the required threshold, the switch closes the circuit to the hot surface igniter (HSI), which lights the gas air mixture. During a typical heating call, the blower and HSI energize simultaneously.

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The only no show socks I have ever found that do not slide down. These are very comfortable and the extra tab on the back provides comfort by keeping shoes from rubbing the back of your foot. The top of the sock also comes up high enough to cushion the top of your foot all while still remaining hidden while wearing tennis shoes or even with my hey dudes.

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Reviewed in the United States on November 30, 2025

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Nick

Omaha, US

★★★★★ 5

Great quality and fast shipping

Size: Medium, Color: (001) Black / Black / Castlerock

These socks are tight but after the first wash and dry , they fit perfect and NEVER slide off , ordered a second pack

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Reviewed in the United States on March 24, 2026

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Bargain Rig

Natrona Heights, US

★★★★★ 5

Comfortable, Durable, and Stylish

Perfect gift choice! Excellent quality socks with a variety of colors to match any wardrobe.

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Reviewed in the United States on November 30, 2025

Verified Purchase

Maranda

Draper, US

★★★★★ 5

Great fit

Size: Medium, Color: White

Perfect fit and they don't slide off the back of your ankle.

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Reviewed in the United States on March 16, 2026

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Jessica Burdett

Lake Worth, US

★★★★★ 5

Best socks!

Size: Medium, Color: Blue

I love these socks! They last for years and they fit so nicely on my feet. I love that I can wear the in tennis shoes or wool boots and they never move!

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Reviewed in the United States on October 21, 2025