Leonard TA-300-LF Single Eye/Face Wash Thermostatic Mixing Valve, 2–10 GPM

ANSI Z358.1 requires emergency eyewash and eye/face wash equipment to deliver tepid water — defined as 60°F to 100°F (16°C to 38°C) — for the full 15-minute flushing cycle. The Leonard TA-300-LF is a single-fixture thermostatic mixing valve built specifically to meet that requirement, factory-set to deliver 85°F (29°C) water to one eye/face wash unit at flow rates from 2 to 10 GPM. The valve uses Leonard's DURA-trol® solid bimetal thermostat — a one-piece sensor that responds to inlet temperature and pressure changes without electronics, batteries, or wear-prone moving parts. ASSE 1071 and CSA certified, with low-lead construction (under 0.25% wetted surface).

EyewashDirect ships the TA-300-LF direct from Leonard with manufacturer-direct pricing and same-day quotes from a dedicated project team.

Specifications

• Model: TA-300-LF
• Manufacturer: Leonard Valve Company (Cranston, RI)
• Application: Single eye/face wash thermostatic mixing valve
• Flow range: 2 – 10 GPM (7.6 – 38 l/min)
• Flow at 45 PSI pressure drop: 9 GPM (34 l/min)
• Maximum system pressure drop: 45 PSI (3.1 bar)
• Factory temperature setting: 85°F (29°C), locked
• High-temp limit stop: 90°F (32°C), adjustable
• Cold water bypass on hot failure: minimum 4 GPM (15 l/min) @ 30 PSI (2.1 bar)
• Cold water failure response: Valve closes automatically
• Recommended hot inlet temperature: 140°F (60°C)
• Maximum supply temperature: 180°F (82°C)
• Maximum supply pressure: 125 PSI (8.6 bar)
• Inlets: ½" sweat, top or bottom
• Outlet: ½" threaded, top
• Dimensions: 7" W × 7" H × 5" D (178mm × 178mm × 127mm)
• Finish: Rough bronze (standard)
• Thermometer: Color-coded outlet dial thermometer, 0–140°F (-10 to 60°C)
• Inlet checkstops: Union angle checkstops standard
• Wall mounting: Integral wall support bracket
• Compliance: ANSI Z358.1, ASSE 1071, CSA Certified
• Lead content: Certified low-lead (less than 0.25% wetted surface area by weight)
• Country of origin: Made in Cranston, Rhode Island, USA
• Available options: CP (chrome-plated finish, threaded inlets/outlet) · IT (inlet thermometers) · TOP (top inlets)

Key Features

DURA-trol® Solid Bimetal Thermostat
The TA-300-LF uses Leonard's signature one-piece bimetal sensor linked directly to the valve porting. Unlike wax or liquid-filled cartridges, DURA-trol cannot be damaged by extreme inlet temperatures or pressure spikes, and there are no diaphragms, springs, or electronics to fail. The sensor responds to changes in supply temperature and pressure within seconds, holding the outlet to the locked 85°F setpoint throughout the 15-minute ANSI flushing cycle.

Locked Temperature Setting + Adjustable Limit Stop
The valve ships locked at 85°F (29°C) — the manufacturer's recommended tepid setpoint for general-purpose eye/face wash use. A separate adjustable high-temperature limit stop is factory-set at 90°F (32°C) so the valve cannot be accidentally turned to deliver scalding water during testing or commissioning. The limit stop must be reset by the installer if incoming hot water exceeds 135°F.

Internal Cold Water Bypass on Hot Water Failure
If the hot water supply fails, the TA-300-LF's internal bypass automatically delivers a minimum of 4 GPM at 30 PSI of cold water to the eye/face wash unit. This keeps the safety fixture functional during a hot-line outage — a critical fail-safe because ANSI Z358.1 requires emergency equipment to remain operational and deliver enough water for a full 15-minute flush. The valve also closes automatically if the cold water supply fails, preventing scalding.

Built-In Dial Thermometer for Weekly Testing
ANSI Z358.1 requires weekly activation testing of emergency eye/face wash equipment. The TA-300-LF includes a color-coded dial thermometer on the outlet (0–140°F range) so a facility safety officer or maintenance tech can verify delivered water temperature at a glance during the weekly flush — no separate gauge or thermometer required.

Compact, Pre-Assembled, Wall-Mounted Package
The valve ships as a single 7" × 7" × 5" assembly with integral wall support, factory-assembled with union angle checkstops on both inlets, dial thermometer installed, and ½" sweat inlets configurable top or bottom. Installation is straightforward — sweat the supply lines, thread the outlet to the eye/face wash, and the unit is ready for testing.

Certified Low-Lead, ASSE 1071, ANSI Z358.1 Compliant
The TA-300-LF carries the certifications most commonly required on commercial and industrial eyewash submittals: ASSE 1071 (the safety mixing valve standard for emergency fixtures), CSA listing, and ANSI Z358.1 compliance. The valve is also certified to the Safe Drinking Water Act low-lead requirement of less than 0.25% wetted surface lead content by weight.

Installation Guidance

The TA-300-LF is sized for a single eye/face wash fixture with a flow demand between 2 and 10 GPM. Do not oversize — Leonard's caution is explicit: thermostatic mixing valves do not deliver accurate temperature control outside their rated flow range. If the connected fixture flows under 2 GPM, choose a smaller valve; if total demand exceeds 10 GPM (e.g., a combination eyewash + drench shower), specify a higher-capacity Leonard emergency mixing valve instead.

Hot supply should be delivered at 140°F for proper performance. The valve will accept up to 180°F supply and up to 125 PSI system pressure, but the limit stop must be reset by the installer if incoming hot water exceeds 135°F (the factory test temperature). If the supply piping runs through unconditioned space or long horizontal runs, Leonard recommends recirculating the tempered water back to the source to prevent the line from cooling between activations — consult Leonard's piping diagrams for the recommended configuration.

Mount the valve on the wall using the integral support bracket. Inlets are ½" sweat (copper) and can be configured top or bottom; the outlet is ½" threaded, top. Union angle checkstops on both inlets allow service isolation without disturbing the supply piping. Per ANSI Z358.1, the connected eye/face wash must be tested weekly and inspected annually — the dial thermometer makes the weekly temperature check a 5-second visual.

Frequently Asked Questions

Does the Leonard TA-300-LF meet ANSI Z358.1?
Yes. The TA-300-LF is ANSI Z358.1 compliant and ASSE 1071 certified for emergency eye/face wash service. ANSI Z358.1 requires tepid water (60°F–100°F) for the full 15-minute flushing cycle, and the TA-300-LF ships factory-locked at 85°F to support ANSI Z358.1 tepid-water compliance when the eyewash system is properly installed, supplied, tested, and maintained.

What flow rate does the TA-300-LF support?
The TA-300-LF is rated for 2 to 10 GPM (7.6 to 38 l/min) of mixed flow, with delivered flow varying based on system pressure drop — at the maximum 45 PSI pressure drop, the valve delivers 9 GPM. This range is sized for a single eye/face wash fixture. Do not undersize or oversize — Leonard explicitly states the valve will not deliver accurate temperature control outside its rated flow range.

What happens if the hot water supply fails?
The TA-300-LF's internal cold water bypass automatically delivers a minimum of 4 GPM at 30 PSI of cold water to the eye/face wash, keeping the fixture functional. This is required so the user can still complete a 15-minute flush during a hot supply outage. If the cold water supply fails, the valve closes automatically to prevent scalding.

Is the Leonard TA-300-LF a replacement for the Guardian G3600-LF?
The TA-300-LF is commonly specified as a replacement for the Guardian G3600-LF — both are single-fixture eye/face wash mixing valves designed for ANSI Z358.1 tepid water service at comparable flow rates. Confirm inlet/outlet pipe locations and dimensions against the existing installation before ordering, since stub-outs may differ between brands.

What temperature is the TA-300-LF set to from the factory?
The TA-300-LF ships with a locked temperature regulator set at 85°F (29°C) and an adjustable high-temp limit stop set at 90°F (32°C). The locked setpoint prevents accidental adjustment in the field. The limit stop must be reset by the installer if incoming hot water exceeds 135°F (57°C), the factory test temperature.

What size are the TA-300-LF inlets and outlet?
The standard TA-300-LF has ½" sweat (copper) inlets — configurable top or bottom — and a ½" threaded top outlet. The optional CP (chrome-plated) configuration has threaded inlets and outlet. Union angle checkstops are included on both inlets for service isolation.

What are the dimensions of the Leonard TA-300-LF?
The TA-300-LF is 7" wide × 7" high × 5" deep (178mm × 178mm × 127mm). The valve includes an integral wall support bracket and ships factory-assembled with the dial thermometer and angle checkstops in place.

Is the TA-300-LF certified low-lead?
Yes. The TA-300-LF is certified to meet Safe Drinking Water Act requirements with less than 0.25% lead by weight on the wetted surface area. The valve is also ASSE 1071 certified, CSA listed, and manufactured in Cranston, Rhode Island.

Pairs Well With / Related Products

Eye/Face Wash Units This Valve Tempers
The TA-300-LF is sized for a single eye/face wash fixture flowing 2–10 GPM. Browse compatible eye/face wash units from the major manufacturers EyewashDirect carries:

• Bradley eyewash and eye/face wash stations
• Guardian eyewash and eye/face wash stations
• Haws eyewash and eye/face wash stations

Replacement Parts and Repair Kits
Leonard publishes two factory-supported repair kits for the TA-300-LF: the Valve Repair Kit (KIT R/TA/M) and the Check Repair Kit (KIT 4/LVC). Browse Leonard repair parts and other tempering valve service kits:

• Leonard valves and replacement parts
• All eyewash and safety shower repair parts

Need More Capacity? Step Up to a Combination Shower + Eyewash Valve
If your installation includes both an eye/face wash and a drench shower — or any fixture totaling more than 10 GPM of flow — the TA-300-LF is undersized. Move up to:

• Leonard TM-600-LF — Single Drench / Combination Emergency Shower TMV, 20 GPM (replaces Guardian G3700-LF)
• Leonard TM-800-LF — Multiple Drench / Combination TMV, 20 GPM (replaces Guardian G3800-LF)
• Browse all Leonard tempering valves