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Near Boiler Trim Kits

Boiler Install Essentials

The Taco® Near Boiler Trim Kit offers a complete, one-box solution for any boiler installation. The Premium Kit offers superior micro-bubble air elimination, easily adjustable pressure setting and system isolation with tank draining capability. The dependable Advanced Kit offers the same superior air elimination and is ideal for your everyday home boiler system. The Select Trim Kit is an easy option that features the same Taco trusted quality & reliability.

Instruction Sheet
Submittal Data
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Performance Data

3450 Combination Boiler Feed Valve and Backflow Preventer:

Max. Inlet Pressure: 150 psi
Min. Delta P Inlet to Outlet: 15 psi
Recommended Setting Range: 10-50 psi +/-3 psi
Factory Setting: 12 psi
Adjustment Capability: 8.5 – 65 psi
Max. Flow Rate (velocity): 25 gpm (8 ft / sec)
Max. Temp.: 210°F

4900 Series® Air Separators:

Max. Working Temp.: 240°F
Min. Working Temp.: 35°F
Max. Working Pressure: 150 psi

Backflow Preventer:

Max. Temp.: 250°F (121°C)
Max. Working Pressure: 175 psi (1206 ksa)
Design Presure Range: 25-250 psi, (172-2413 kps)

Boiler Feed Valves (Reducing Valves):
Max. Fluid Temp.: 212°F (100°C)
Max. Supply Side Pressure: 100 psi (689 kpa)
Setting Range: 10-25 psi (69-172 kpa)
Factory Setting of System Side: 12 psi (83 kpa)

Dual Controls:
Max. Fluid Temp.: 212°F (100°C)
Max. Supply Side Pressure: 100 psi (689 kpa)
Relief Valve Set to Release at 30 psi (207 kpa)

HEX-30 Expansion Tank:

Max. Working Pressure: 100 psig
Max. Working Temp.: 240°F
Tank Pre-Charge: 12 psig




  • ASSE listed boiler feed/backflow (Premium)
  • ASSE listed backflow (Advanced and Select)
  • Select kit combinations suit all preferences
  • All fittings & connections included
  • Designed for easy installation
  • 1” & 1¼” sizes available
  • 4½ gallon expansion tank included
  • Suitable for use in closed loop systems with water or up to 50% water / glycol solution
  • Hydronic 
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