You are buying a 2 1/2" Heater Nut Kit which includes the nut, split retainer and a Waterway Style gasket for use with a 2 1/2" Waterway Heater Union. Note: You need to measure your T gasket bead part that fits into the groove to be sure you get the right gasket there are (2) different groove widths. We offer both gasket groove widths with this part in our store this one is the waterway style and is 2 7/8" the other is a Therm style and is 3 1/8" Center to center. The Heater Flange Nut slides over the heater tube, then slip the white split nut on to hold in place. If your plumbing is 2" or 2 1/2" and your heater is 2 1/2" this part is correct. This version is the 4th most popular version. 2" is the most popular, 1 1/2" x 1 1/2" is 2nd most popular and 1 1/2" X 2" is 3rd most popular. This part is used in hot tubs to plumb a heater tube to a heater union. We have plenty of these. Buy with caution I Do Not Accept returns! I do accept Paypal only. The Lower 48 states is Free. I Do Ship Worldwide with Global Shipping Program!! Note: The Heater tube in pictures is NOT included!! ASP 711-6020, ASP 86-02370, ASP 86-02360 This is a chart for the outside of your plumbing pipes so you can figure out what size parts to order. Note: The actual size a part is called is not the actual size of the hole in the part it is really the Inside Diameter of the pipe that would glue into that part which doesn't make sense, since you cannot see inside the pipe. Therefore I am giving you the measurements of the outside of the pipe so you know what size part to order. For example a part that ½" plumbing would glue in to would actually measure ¾" inside the hole of the part and on the outside of the pipe that glues into the part.

• 4" Outside Diameter
• 3" Inside Diameter
• Nut 1 3/16" Wide
• Fits Most 3" Spa Heater Tubes
• Nut inside without retainer ring 3 5/16"

4" Outside DiameterAmerican Spa Parts