Raypak
Raypak 003766F Inlet and Outlet Flange Kit – 1-1/2 Inch and 2 Inch, Cast Iron
Raypak 003766F Inlet and Outlet Flange Kit – 1-1/2 Inch and 2 Inch, Cast Iron
Raypak 003766F Cast Iron Inlet & Outlet Flange Kit
Original cast iron flange kit for select Raypak pool and spa heaters. This item is discontinued and has been replaced by the updated brass Raypak 013812F flange kit.
The Raypak 003766F inlet and outlet flange kit was used to create the water connection points between select Raypak heater manifolds and 1-1/2 inch or 2 inch plumbing. This original cast iron version is no longer available.
Discontinued: Updated Replacement Available
Raypak 003766F has been discontinued. The current updated replacement is the Raypak 013812F Brass Flange Kit.
The updated brass kit performs the same inlet and outlet connection function while offering improved corrosion resistance compared with the original cast iron design.
Updated Replacement Path
Replace obsolete 003766F flanges with Raypak 013812F instead of attempting to repair severely corroded cast iron fittings.
Heater Water Connections
Flanges connect the heater water manifold to the pool plumbing and help maintain a sealed water path.
Confirm Heater Model
Verify your Raypak heater model and existing manifold configuration before ordering the replacement kit.
Product Overview
The Raypak 003766F was the original cast iron inlet and outlet flange kit used on select Raypak gas pool and spa heaters. These flanges secure the plumbing connections at the heater’s water manifold.
Because the original part is discontinued, customers needing to replace cracked, corroded, leaking, or deteriorated 003766F flanges should use the current Raypak 013812F brass replacement kit.
Current Replacement Part
The correct current replacement for Raypak 003766F is:
- Raypak 013812F — Brass Inlet and Outlet Flange Kit
The updated 013812F kit is designed for compatible 1-1/2 inch and 2 inch heater plumbing applications and replaces the obsolete cast iron flange configuration.
When to Replace the Flange Kit
- Water leaking at the heater inlet or outlet plumbing connection
- Visible corrosion, pitting, rust, or cracking on the flange body
- Deteriorated sealing surfaces or damaged gaskets
- Loose or unstable plumbing connection at the heater manifold
- Replacing an old cast iron flange with the updated brass version
Specifications
| Original Part Number | 003766F |
|---|---|
| Status | Discontinued |
| Current Replacement | Raypak 013812F Brass Flange Kit |
| Original Material | Cast Iron |
| Replacement Material | Brass |
| Connection Sizes | 1-1/2 inch and 2 inch plumbing connections |
| Application | Inlet and outlet water manifold connections on select Raypak gas pool and spa heaters |
Compatibility
This discontinued part and its 013812F replacement are used on select Raypak atmospheric gas pool and spa heaters. Compatibility can vary by heater series, age, water manifold configuration, and plumbing arrangement.
Please verify your heater model number and existing flange configuration before ordering. Product photos and connection size alone are not enough to confirm fitment.
Installation Notes
Heater water connection repairs should be completed by a qualified pool professional or experienced technician.
- Shut off electrical power and gas supply to the heater before servicing.
- Allow the heater and plumbing to cool completely.
- Drain water from the heater and connected plumbing before removing the old flanges.
- Inspect manifold connection surfaces for corrosion, cracks, or damage.
- Use the correct gaskets and mounting hardware supplied with the replacement kit.
- Pressure-test the plumbing connection and inspect for leaks before returning the heater to service.
Aqua Terra Backyard Expert Tip
A leaking heater connection is not always caused by the flange itself. Before ordering, inspect the gasket surfaces, union connections, plumbing alignment, manifold condition, and any visible corrosion around the heater water connections. Replacing a damaged cast iron flange with the updated brass kit is often the best long-term repair path.
Frequently Asked Questions
Is Raypak 003766F still available?
No. Raypak 003766F is discontinued.
What replaces Raypak 003766F?
The current replacement is Raypak 013812F, a brass inlet and outlet flange kit for compatible applications.
Will the brass 013812F work in place of the old cast iron flange?
It is the current replacement path for compatible Raypak heater applications. Confirm your heater model and existing plumbing configuration before ordering.
Does this part fix every heater leak?
Not necessarily. Leaks can also come from damaged gaskets, unions, heater manifold corrosion, plumbing stress, or other water connection issues.
Shipping & Returns
This listing is for a discontinued legacy part number and is provided for reference and replacement identification purposes. Customers needing a working replacement should order the updated Raypak 013812F brass flange kit after confirming compatibility.
Please verify heater model, plumbing size, and flange configuration before ordering replacement heater parts.
Need Help Confirming Your Raypak Flange Kit?
Contact Aqua Terra Backyard with your Raypak heater model number, a photo of the existing inlet and outlet connection, and the original part number if available. We will help identify the correct current replacement before you order.
