Pros, Join Our TradeMaster Program!
1-1/2" Integral Press 551 Series DISCAL Air Separator w/ Service Valve

Air separators are used to continuously remove the air contained in the hydronic circuits of heating and cooling systems. The air discharge capacity of these devices is very high. They are capable of removing automatically all the air present in the system down to the micro-bubble level.

The circulation of fully de-aerated water enables the equipment to operate under optimum conditions, free from noise, corrosion, localized or mechanical damage. Micro-bubbles, fusing with each other, increase in volume (get larger) until they become large enough to rise to the top where they are automatically released.

Furnish and install on the plans and described herein, a Caleffi DISCAL® Air Separator as manufactured by Caleffi. Each separator must be designed with a brass valve body and seals in peroxide-cured EPDM. The separator design must include a removable internal glass-reinforced nylon fiber mesh - PA66G30, coalescing medium (304 stainless steel for compact version), to automatically remove all air present in the system. Each separator shall be Caleffi model 551 or approved equal.
Hide Description
Manuals (2)


Product Type:

Dirt Eliminator

Connection Method:


Connection Type:

Press x Press

Max Pressure (PSI):


Max Temp (F):


Flow Rate (GPM):




Temperature Range (F):

32°F to 250°F


Product Review

Product Q&A

Add-on Item

This item is cost-prohibitive to ship on its own but is available to ship with orders over $200.

Why don't we show the price of this item?

We try to always offer you the lowest prices possible, but some manufacturers require that we only show these low prices once you take further action.

To see the price, simply add the item to your cart or sign in.