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Brass thermostatic mixing valve with compression fittings

Acorn Engineering Company

Acorn Engineering Company ST70-38 Tempering Valve Brass 125 psi

SKU CH-C5X0-KBFBB

Thermostatic mixing valve blends hot and cold water to 85–115 °F for lavatories, includes 3/8 in compression tee and integral check valves

  • Product colorTransparent
  • Product typePipes, Valves & Fittings
  • Delivers safe mixed water for lavatories with a thermostatic valve
  • Handles supply pressures up to 125 psi with brass construction
  • Operates reliably from 35 to 180 °F inlet temperatures
  • Provides 4 gpm flow through 3/8 in compression connections
  • Includes integral check valves and a brass compression tee for installation

Thermostatic Mixing Valve for Lavatories

The Acorn Engineering Company ST70-38 is a thermostatic mixing valve designed for lavatory installations. It features a brass body with compression inlet and outlet connections sized at 3/8 inch. The unit includes an integral brass compression tee and built-in check valves to prevent cross-flow between hot and cold supplies.

Stable Temperature Control Under Continuous Flow

The valve maintains a mixed output temperature between 85 and 115 degrees Fahrenheit while handling a flow rate of 4 gallons per minute. It operates reliably with cold inlet temperatures from 35 to 80 degrees and hot inlet temperatures from 120 to 180 degrees Fahrenheit. Maximum working pressure is rated at 125 psi for sustained supply conditions.

Direct Replacement for Manual Mixing Valves

This valve replaces manual mixing fittings where automatic temperature regulation is required for user safety and comfort. The upgrade is worthwhile when supply temperatures fluctuate or when codes require anti-scald protection at the point of use. It fits existing 3/8 inch compression piping without adapter changes.

How it compares

Measured against everything we stock in Bath Accessories & Soap Dispensers, at today’s prices. Recalculated every night.

Price $63.99
Pricier than about 62% of the 1,499 comparable items (median $39.99).

Specifications

Product
Brand nameACORN CONTROLS
Product colorTransparent
Product typePipes, Valves & Fittings

Questions about this item

Does the brass valve body add noticeable heat to the water passing through it during all-day use?

The valve mixes hot water at 120 to 180 °F with cold water at 35 to 80 °F to deliver a steady 85 to 115 °F outlet, so the brass body simply follows the mixed-water temperature.

Will the 3/8-inch compression tee included in the box connect directly to my existing supply stops?

The kit includes a 3/8-inch brass compression tee that threads onto standard 3/8-inch compression supply stops without extra adapters.

Can this valve protect an older lavatory faucet from pressure spikes above 125 psi?

The valve is rated for a maximum of 125 psi and includes integral check valves, so it will not handle spikes above that rating.

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