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Air pressure switches are associated with gas heaters which incorporate power venting into their design.
This switch is not intended to operate on air pressure into the switch, they are intended to activate by air being drawn out of the switch.
Simply put, by sucking air out of the air line running to the switch, the switch closes.

Most of the switched listed are pre-set at the factory to accommodate differences in altitudes for specific heater models.
 

 Special Order Only

WAS Pentair  #472325
200 NT STD ( NAT & LP ) includes ASME models
(3,000 to 6000 ft)  set @ 0.35

2-5/8" Diameter - Blue Color Coded Label
3-1/8" across mounting holes on switch
Micro Switch mounted Internal in switch


 

H2O# 9764986

Pentair  #472180
250 & 300  NT STD ( NAT & LP ) includes ASME models
(3,000 to 6000 ft)  set @ 0.65

2-5/8" Diameter - Green Color Coded Label
3-1/8" across mounting holes on switch
Micro Switch mounted Internal in switch

H2O# 9764991
Discontinued by Manufacturer
Pentair  #472328
400 NT STD ( NAT & LP ) includes ASME models
(3,000 to 6000 ft)  set @ 1.05

2-5/8" Diameter - Pink Color Coded Label
3-1/8" across mounting holes on switch
Micro Switch mounted Internal in switch

H2O# 9764984
 Note - This items is now larger
Pentair  #472178
200 NT TSI  ( NAT ) includes ASME models
(3,000 to 6000 ft)  set @ 0.22

2-1/4" Diameter - Red Color Coded Label on side
3-7/8" across mounting holes on switch
Micro Switch mounted Internal in switch


 

H2O# 9764985

Pentair  #472179
250 NT TSI  ( NAT ) includes ASME models
(3,000 to 6000 ft)  set @ 0.45

2-5/8" Diameter - Brown Color Coded Label
3-1/8" across mounting holes on switch
Micro Switch mounted Internal in switch

H2O# 9764989

Pentair  #472327
300 & 400 NT TSI  ( NAT ) includes ASME models
(3,000 to 6000 ft)  set @ 0.8

2-5/8" Diameter - Gray Color Coded Label
3-1/8" across mounting holes on switch
Micro Switch mounted Internal in switch

H2O# 9833321

Raypak  #002542f
GBI 33 (all altitudes)
5" Diameter
3-7/8" across mounting holes on switch
Includes short hose and vent tube nozzle
Micro Switch mounted External on switch
Used on discontinued side mount spa heater


 

H2O# 7408290

Pentair  #471428
PowerMax (3,000 to 6000 ft)
3-1/4" Diameter
Mounting holes on 1-5/8" attached bracket
Micro Switch mounted External on switch


 

H2O# 9892727

Jandy / Laars  #R0302000
LX / LT (all altitudes)
2-5/8" Diameter
3-1/8" across mounting holes on switch
Includes mounting bracket and hose
Micro Switch mounted External on switch
3-1/2" across mounting holes on bracket
REPLACES OLDER STYLE, VIEW HERE

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