We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Caleffi 551008A brass air separator with 1-1/2 inch NPT connections

Caleffi

Caleffi 551008A Dis Air Separator 1-1/2" Npt

SKU CH-PQ34-0YDT4

Removes air from hydronic heating systems through a 1-1/2 inch NPT connection

  • Removes trapped air for efficient hydronic operation
  • 1-1/2" NPT connection fits standard piping
  • Caleffi engineering ensures reliable long-term performance
  • Compact design installs easily in tight mechanical rooms
  • Listed by manufacturer April 29 2023

Purpose and fit

The Caleffi 551008A Dis Air Separator is a hydronic component designed to remove dissolved air from closed-loop heating and cooling systems. It installs directly into 1-1/2" NPT piping and targets installers and facility managers who need reliable air elimination without chemical additives.

What the unit changes

By separating micro-bubbles before they collect in radiators or fan coils, the separator reduces noise, improves heat transfer and protects circulators from cavitation damage. The brass body resists corrosion in glycol-mixed water, so the system stays balanced longer and maintenance intervals extend.

Who should choose it and who should not

This separator suits new hydronic installations or retrofit projects that use 1-1/2" NPT connections and require continuous air removal. Builders working with smaller pipe sizes, press-fit or sweat connections, or systems that demand magnetic dirt separation alongside air venting will need a different configuration.

Highlights

  • Removes trapped air for efficient hydronic operation
  • 1-1/2" NPT connection fits standard piping
  • Caleffi engineering ensures reliable long-term performance
  • Compact design installs easily in tight mechanical rooms
  • Listed by manufacturer April 29 2023

Specifications

BrandCALEFFI

Questions about this item

Does the 551008A Dis Air Separator require any scheduled internal maintenance or replacement parts over its service life?

The Caleffi 551008A Dis Air Separator has no user-serviceable internal components and does not require scheduled maintenance or replacement cartridges.

What is the first performance limit reached when the 551008A runs continuously in a hydronic system?

The first limit is the air-separation capacity at the 1-1/2" NPT connection size; exceeding the design flow rate reduces micro-bubble removal efficiency.

How much noise or heat does the 551008A generate during all-day operation in a heating loop?

The separator has no moving parts, produces no audible noise and adds no measurable heat to the fluid stream during continuous operation.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.