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Sticker on the pump body (the part with the basket), not on the motor. Motor labels from Century, A.O. Smith or Regal won't match parts.
Label on the side of the tank near the base. Size is in sq ft, e.g. 420 sq ft = C4030 or CCP420.
Rating plate inside the front access panel. Note the BTU and gas type (NG or LP).
Molded into the body or printed on top. Robotic cleaners: on the power supply.
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Raypak Heater Bulb Sensor Well | 007211F
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CA P65 Warning: Cancer and reproductive harm. www.p65warnings.ca.gov
The Raypak 007211F is a genuine OEM stainless steel bulb sensor well — also known as a thermowell — designed to protect the temperature sensing bulb within the heat exchanger on a wide range of Raypak pool and spa heater models. The sensor well acts as a protective sleeve between the temperature sensor and the pool water flowing through the heat exchanger, shielding the sensor from direct water contact and pressure while still allowing accurate temperature measurement for precise heater operation. Measuring 3-3/8 inches in length with a 15/32-inch inside diameter and a flared 9/16-inch outside diameter at the open end, this single-piece stainless steel thermowell is engineered for corrosion resistance and long-term thermal durability in demanding pool heater environments. Compatible with Raypak heater models 53, 53A, 53B, 55A, 151, 153, 153A, 155A, 181, 183A, 261, 263A, 331, 333A, 401, and 403A. Formerly listed under Raypak part number 350336.
- Genuine Raypak OEM Stainless Steel Thermowell: Factory-authorized 007211F sensor well manufactured from a single piece of stainless steel to exact Raypak specifications, ensuring a precise fit and dependable corrosion resistance throughout the service life of compatible heater models.
- Protects Temperature Sensor from Direct Water Contact: The sensor well creates a protective barrier between the temperature sensing bulb and pool or spa water flowing through the heat exchanger, shielding the sensor from water pressure and chemical exposure while maintaining accurate temperature readings for proper heater control.
- Precise OEM Dimensions for a Secure Fit: Measures 3-3/8 inches in length with a 15/32-inch inside diameter and a flared 9/16-inch outside diameter at the open end, matching factory dimensions exactly for a secure, properly seated installation in the heat exchanger.
- Broad Raypak Model Compatibility: Fits a wide range of Raypak pool and spa heater models spanning the full legacy lineup — including models 53, 53A, 53B, 55A, 151, 153, 155A, 181, 183A, 261, 263A, 331, 333A, 401, and 403A — making it one of the most versatile thermowell replacements in the Raypak parts catalog.
- Replaces Legacy Part Number 350336: The 007211F is the current Raypak OEM part number replacing the older 350336 designation — ensuring customers searching by either number can confidently identify this as the correct replacement for their compatible heater model.
Compatible with most Raypak heaters, please refer to your owners manual to confirm compatibility