PresAirTrol Side Spout Pressure Switch [21A] [1/8" Barb] [DPDT] (PR21120A)

Type:	Heater Parts
Mfr	Presair Trol
Mfg Part #	PR21120A
Hzn Part #	47-369-1015

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TAGS: heaterparts, presairtrol, spaparts

Details

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SEE REPLACEMENT PART: OBSOLETE

PresAirTrol Side Spout Pressure Switch [21A] [1/8" Barb] [DPDT] (PR21120A) is a replacement heater or heater service component from Presair Trol for compatible pool, spa, or bath heating systems. It is used when servicing worn, damaged, or failed heater assemblies where the correct model series, fuel or voltage configuration, sensor style, element size, or hardware fit must be matched. Use part number PR21120A when matching this item to an existing component, owner’s manual, parts diagram, or service record. Key identifiers and configuration details include 21A, 1/8" Barb, DPDT. Using the correct replacement part helps support dependable heating performance, safe operation, and proper equipment service.

Heater parts should be selected by exact part number and application details. Confirm electrical ratings, gas type, element dimensions, plumbing connections, and model compatibility before ordering, and have installation performed by a qualified service professional when required.

Genuine or listed Presair Trol replacement option for Heater Parts applications
Designed for matching by part number, equipment model, and physical configuration
Useful for repair, rebuild, routine maintenance, or replacement service
Compare size, voltage, color, connection type, and model details before ordering
Professional installation is recommended for heater, gas, electrical, and pressure-sensitive repairs

PresAir Trol – Air Switches, Pneumatic Controls and Spa Control Components

Who is PresAir Trol?

PresAir Trol is a manufacturer of pneumatic control components, specializing in air switches and pressure-activated controls used in spa and bath systems. Known for reliability and precision, PresAir Trol products are widely used in applications where safe, low-voltage control of electrical equipment is required.

What products does PresAir Trol specialize in?

PresAir Trol specializes in air switches, pneumatic buttons, pressure switches, and control assemblies. Their product lineup includes components used to activate pumps, blowers, and lighting systems in spas and whirlpool baths. These systems use air pressure instead of direct electrical contact, improving safety in wet environments.

Why choose PresAir Trol parts for your pool or spa?

PresAir Trol products are known for safety, durability, and consistent performance. Pneumatic controls eliminate the need for direct electrical switching at the user interface, reducing risk in water-exposed environments. Spa owners and professionals choose PresAir Trol for dependable control solutions that enhance both safety and ease of use.

How do you identify and choose the correct PresAir Trol part?

To select the correct PresAir Trol component, it’s important to match specifications such as switch type, hose connection size, number of functions, and system compatibility. Reviewing part numbers and configuration ensures proper fit and operation. Choosing the right component helps maintain safe and reliable system control.

Need help finding the right PresAir Trol part?

At Bath & Spa Parts Online, we carry a wide selection of PresAir Trol pool, spa, and bath parts ready to ship. Can’t find what you need? Contact our Product Specialists at 800-918-9143, use the live chat, or visit our Contact Us page. For installation guides, part diagrams, and troubleshooting resources, visit the Bath & Spa Parts Online Knowledge Base for expert support.