Brand: Jomar Valve SKU: 810-504G
Product Overview
The Jomar Valve 810-504G is a 3/4-inch threaded tankless water-heater isolation and service-valve kit with three-way ball-valve operation. It is designed to simplify installation, routine flushing, draining, and servicing of compatible tankless water heaters that use 3/4-inch NPT water connections. The lead-free, dezincification-resistant brass construction is suitable for potable-water applications and uses Jomar's T.E.A.-coated three-way ball design.
Each valve uses a blowout-proof stem and a triple-sealing arrangement with two FKM O-rings and a PTFE seal. The kit is 100% leak tested and carries Jomar's lifetime leakproof-stem warranty. A 3/4-inch lead-free pressure-relief valve rated for water heaters up to 200,000 BTU per hour is included. The valve assembly is rated 600 WOG and has a 29 in-Hg vacuum rating.
The 810-504G is not limited to one tankless-water-heater brand, but compatibility should not be assumed from the heater name alone. Confirm that the appliance requires 3/4-inch NPT service valves, that the included relief-valve capacity meets the appliance requirements, and that clearances and local plumbing-code provisions are satisfied. Installation and service should be completed by a qualified professional using the current Jomar instructions and the water-heater manufacturer's installation manual.
Key Features
- 3/4-inch NPT tankless water-heater service-valve kit
- Three-way ball-valve design for isolation and flushing
- Lead-free, dezincification-resistant brass alloy
- T.E.A.-coated ball
- Triple-sealing stem with two FKM O-rings and PTFE seal
- Blowout-proof stem
- 600 WOG rating
- 29 in-Hg vacuum rating
- 100% leak tested and made in Italy
- NSF 61 and NSF 372 certified
Included Relief Valve
The kit includes a 3/4-inch lead-free pressure-relief valve rated for tankless water heaters up to 200,000 BTU per hour. Verify the required relief-valve type, rating, discharge piping, and installation orientation for the specific water heater and local code.
Common Uses
- New tankless water-heater installations
- Adding isolation valves for future maintenance
- Connecting flushing hoses for descaling service
- Replacing a compatible 3/4-inch threaded service-valve kit
Compatibility and Installation Notes
Use only with equipment that accepts 3/4-inch NPT water connections and a compatible service-valve layout. Do not rely on a general brand statement; verify the exact water-heater model manual. Observe the marked hot and cold sides, use code-approved thread sealant, avoid overtightening, and route the relief-valve discharge according to applicable codes. The 600 WOG valve rating is not the relief-valve set pressure.
Frequently Asked Questions
Will this kit fit every Rinnai or other tankless water heater?
No universal compatibility claim should be made. It fits applications designed for this 3/4-inch NPT service-valve configuration, subject to the appliance manual and local code.
Does the kit support system flushing?
Yes. The three-way service-valve arrangement provides access for properly connected flushing and descaling equipment.
Is a pressure-relief valve included?
Yes. A 3/4-inch lead-free relief valve rated up to 200,000 BTU per hour is included.
Is this a lead-free potable-water product?
Yes. Jomar identifies the wetted surfaces as containing less than 0.25% lead and lists NSF 61 and NSF 372 certifications.
Why Buy the Jomar 810-504G from Big Frog Supply?
This listing identifies the exact 3/4-inch NPT connection, relief-valve capacity, certifications, and service purpose without promising compatibility with every heater from a particular brand. Big Frog Supply also carries tankless water heaters and installation components, helping installers compare the valve-kit requirements against the appliance specifications before ordering.
