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Na553379 - Boiler Trim Kit, 1 1/4" Sweat, 4.4Gal With Asse 1012 Back Flow - Caleffi

Brand: Caleffi
Part #: Na553379
$524.16

List Price: $819.00
🚚 Factory Ordered This item is ordered straight from the factory just for you! We'll ship it as soon as it reaches our distribution center.
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Brand New Part
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Description / Na553379 - Boiler Trim Kit, 1 1/4" Sweat, 4.4Gal With Asse 1012 Back Flow - Caleffi

Boiler Trim Kit, 1 1/4" Sweat, 4.4Gal With Asse 1012 Back Flow
Caleffi • Hydraulics & Valves
Na553379Boiler Trim

Caleffi Na553379 boiler trim kit, 1 1/4" sweat, 4.4gal with asse 1012 back flow hydronic valve replacement part

Genuine Caleffi boiler trim kit — a complete assembly of essential boiler safety and fill components including pressure relief valve, pressure/temperature gauge, automatic air vent, and AutoFill™ makeup water assembly with ASSE 1012 backflow preventer. Pre-assembled for rapid boiler commissioning.

✅ ASSE Certification

▶ ASSE 1012 — Backflow Preventer with Intermediate Atmospheric Vent

🔌 Connection Type

SWT (Sweat/Solder) — copper solder connection, requires soldering to copper pipe

🔍 What This Part Fixes

✖ Problem Symptoms

  • ✖ Multiple boiler trim components required as separate purchases and installations
  • ✖ New boiler installation requiring complete trim package
  • ✖ Existing boiler trim components aging — full kit replacement for reliability

✓ What This Restores

  • ✓ Complete boiler trim in one kit: relief valve + P/T gauge + air vent + AutoFill with backflow
  • ✓ ASSE 1012 backflow preventer on makeup water assembly
  • ✓ Pre-assembled for faster installation
  • ✓ Correct component sizing for the boiler rating specified

🔧 Installation Overview

  1. Install trim components at specified boiler connections per boiler manufacturer diagram
  2. Safety relief valve discharge must be piped to a safe drain — never cap
  3. Set AutoFill makeup water pressure per system design fill pressure (typically 12–15 psi)
  4. Commission by pressurizing system and verifying all gauges, vents, and relief valve function

📋 Specifications

DetailValue
Part NumberNa553379
BrandCaleffi
TypeBoiler Trim Kit
IncludesPressure relief valve, P/T gauge, automatic air vent, AutoFill with ASSE 1012 backflow
ApplicationBoiler Installation — Complete Trim Package
Pipe Size1 1/4"
Connection TypeSWT (Sweat/Solder)
CertificationASSE 1012 — Backflow Preventer with Intermediate Atmospheric Vent

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