3/4" Copper Standard Water Heater Connector

Sioux Chief 633X18PK – 3/4" x 18" Copper Water Heater Connector, PEX Crimp x FIP Swivel

The Sioux Chief Tomahawk 633X18PK connector is a lead-free, 3/4" x 18" copper water heater supply line designed to facilitate secure, code-compliant connections between PEX plumbing systems and water heater inlets. Featuring a Type L copper body with a crimp PEX connection on one end and a female iron pipe swivel (FIP) on the other, this flexible connector supports high-temperature, high-pressure hot water installations and simplifies service loop configurations.

Professional Performance Features

• Material: Type L copper tube offers superior strength, corrosion resistance, and compliance with potable water standards.
• Connection Type: Crimp PEX x FIP swivel; brass nuts allow secure threaded connection to water heater inlets/outlets.
• Dielectric Isolation: Provides physical separation between dissimilar metals to minimize galvanic corrosion at water heater connections.
• Lead-Free Compliance: Certified to NSF/ANSI 372 and NSF 61-G for use in potable systems; meets national lead-free plumbing standards.
• Temperature & Pressure Rated: Suitable for 210°F and 200 psi service applications in domestic hot water systems.

Technical Specifications

• Nominal Size: 3/4 inch
• Length: 18 inches
• Material: Copper tube with brass fittings
• End Connections: 3/4" PEX (ASTM F1807) x 3/4" FIP Swivel
• Working Pressure: 200 psi
• Temperature Rating: Up to 210°F
• Compliance: Lead-Free, NSF/ANSI 61-G, NSF/ANSI 372

Installation Notes

This connector is designed for use with ASTM F1807 crimp-style PEX fittings. Proper installation requires a calibrated PEX crimping tool and compliance with local codes. The FIP swivel nut should be torqued appropriately using a wrench on the hex fitting only—avoid over-tightening or stressing the pipe body. Dielectric unions or fittings may still be required by local jurisdiction depending on water heater type and piping materials.

For the Field Professional

Contractor Use: This Sioux Chief connector is manufactured to handle repetitive installation conditions across residential and light commercial jobs. It’s ideal for new installs, emergency replacements, or retrofit tie-ins where both flexibility and durability are critical. Stocked in 18" lengths to accommodate common connection distances while maintaining minimal installation stress on heater nipples.

Code & Certification

• NSF 61-G and NSF 372 certified
• Complies with IPC, UPC, and local code requirements for water heater connections
• Lead-free law compliant (federal and state)

Summary

The Sioux Chief 633X18PK copper water heater connector is engineered for longevity and safety in high-demand plumbing environments. Its combination of Type L copper tubing, crimp PEX compatibility, and threaded FIP swivel connection provides a versatile and robust solution for hot water system installations.