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💧 Stop piecing together mismatched fittings — this all-in-one service valve kit has everything you need to install or service your tankless water heater correctly, safely, and to code. Whether you’re a DIY homeowner replacing an old unit, a plumber looking for a reliable kit, or a property manager maintaining multiple properties, this 3/4” kit eliminates guesswork. It includes two isolation valves (hot and cold) with PTC quick-connect fittings, a pressure relief valve, and thread seal tape — all crafted from durable, lead-free brass and SUS304 stainless steel. The standard NPT threads fit most gas tankless water heaters from brands like Rinnai, Navien, Rheem, and Noritz. The isolation valves allow you to flush your heater with vinegar to remove scale (essential for longevity), while the pressure relief valve adds essential safety. Save time, money, and future headaches with a complete, leak-free solution for bathrooms, boiler rooms, or kitchens.
Includes 2x 3/4” NPT to 3/4” PTC isolation valves (hot & cold), 1x pressure relief valve (safety release), and thread seal tape. No additional trips to the hardware store. Each component is pre-assembled and tested for a hassle-free installation. Perfect for both new installs and retrofits.
All wetted parts are made from high-quality lead-free brass (meets federal safe drinking water standards) and SUS304 stainless steel. This ensures no heavy metal leaching, excellent resistance to corrosion and mineral buildup, and long-term leak protection. Built to withstand high temperatures and pressure.
Uses industry-standard 3/4” NPT threads on one side and 3/4” PTC (push-to-connect) on the other. The included thread seal tape ensures a secure, leak-free seal. No special tools required — just hand-tighten the brass nuts and push the PTC fittings onto your heater's water lines. Compatible with most gas tankless water heaters.
The two isolation valves allow you to shut off water to the heater without cutting off the whole house supply. Connect a pump and descaling solution (vinegar) through the service ports to remove lime scale — a critical step for extending heater life. No need to call a plumber for routine maintenance.
The kit comes with a factory-set pressure relief valve (typically 150 PSI) that automatically releases excess pressure to prevent tank or pipe bursts. This is required by code for most tankless water heater installations. Having it in the kit saves you $20–30 and ensures compliance.
| Item Code | T3342P479428 |
|---|---|
| Product Type | Single Box Product – Service Valve Kit for Tankless Water Heaters |
| Material | Lead-Free Brass + SUS304 Stainless Steel |
| Color | Brass / Coppery |
| Connections | 3/4” NPT female to 3/4” PTC (push-to-connect) on isolation valves; 3/4” NPT on relief valve |
| Included Components | 2x Isolation Valves (hot/cold), 1x Pressure Relief Valve, Thread Seal Tape |
| Maximum Working Pressure | 150 PSI (relief valve set point) |
| Temperature Range | 33°F – 210°F (suitable for tankless water heaters) |
| Product Dimensions (L×W×H) | 9.45” × 7.48” × 3.94” |
| Product Weight | 3.44 lbs |
| Package Dimensions | 9.45” × 7.48” × 3.94” |
| Package Weight | 3.54 lbs |
| Compatibility | Most gas tankless water heaters (Rinnai, Navien, Rheem, Noritz, EcoSmart, etc.) |
| Certification | Lead-free compliant (safe for potable water) |
Yes — this kit uses standard 3/4” NPT threads on the valve side and 3/4” PTC (push-to-connect) fittings on the heater side. Most major brands (Rinnai, Navien, Rheem, Noritz, Takagi, EcoSmart, Stiebel Eltron) use 3/4” water connections. The PTC fittings work with PEX, CPVC, or copper pipes of the same diameter. If your heater has 1/2” connections, you’ll need an adapter (not included). Check your heater’s manual.
Absolutely. The brass used in this kit complies with the Safe Drinking Water Act and NSF/ANSI 61 standards. Lead content is less than 0.25% (the federal definition of “lead-free”). It’s perfectly safe for potable water systems, including whole-house tankless heaters that supply kitchen and bathroom faucets.
No — the kit includes thread seal tape. You will need basic tools: an adjustable wrench for the brass nuts, and a pipe cutter/deburring tool if you’re cutting PEX or copper. The PTC fittings require no special tools — just push the pipe in fully. For gas connections, you will need a separate gas line kit (not included). This kit covers the water side only.
The pressure relief valve (PRV) automatically releases water if pressure exceeds 150 PSI, preventing dangerous bursts or leaks. Most local plumbing codes require a PRV on any tankless water heater installation. This kit includes a high-quality brass PRV — buying it separately would cost $20-30. It’s pre-calibrated and ready to install.
Yes — that’s one of the main benefits. The isolation valves have integral service ports (often with caps). Close both valves, attach a pump and hoses to the ports, and circulate descaling solution (vinegar) through the heat exchanger. This removes lime scale and restores efficiency. Flushing once a year is recommended for areas with hard water.
