Watts LF150A 1/2 Lead-Free Water Hammer Arrestor, MNPT

The Watts LF150A 1/2 is a lead-free rechargeable tank-type water hammer arrestor with male MNPT connections. It absorbs the pressure spike a quick-closing valve or appliance creates, protecting piping and fixtures from banging and shock damage. It features a rubber seat. Rated to 150 psi and up to 180°F. This model is certified lead-free for potable-water installations.

This 1/2 inch lead free water hammer arrestor provides economical and effective single fixture protection used in residential or domestic water applications such as dishwashers, washing machines, and quick closing faucets. It is designed to control the water pressure shock and prevent water hammer conditions that are damaging to pipes and appliances. It consists of a stainless steel top and lower chamber, sealed-in diaphragm which flexes to absorb the shock, and a lead free brass hex adapter for easy installation. This may be installed in new or existing plumbing systems vertically, horizontally or at any angle and should be installed as close to the shock source as possible, with one unit for each hot and cold water line up to 150 psi (10.6 bar) working pressure. It is factory air charged at 30 psi (207 kPa) and is easily rechargeable with a standard tire valve connection and air-tight sealing cap.

Features

• 1/2" NPT connection for easy installation
• Unit is factory pre-charged to 30 psi (207 kPa)
• Easily rechargeable with standard tire valve
• Molded diaphragm with a special thermoplastic coating to prevent rust

Common Questions

What size do I need for my fixtures?

The LF150A 1/2 is a single-fixture arrestor and is not rated by PDI letter size — size it to the connection at the fixture it serves, and install one unit on each of the hot and cold lines, as close to the shock source as possible. If your specification calls out a PDI size (AA–F) for a multi-fixture branch, use a PDI-rated model such as the LF15M2 or SS series instead.

Is it ASSE 1010 certified?

We do not have an ASSE 1010 listing on file for the LF150A 1/2 — check the linked spec sheet for its current certifications. Where a job specifically requires an ASSE 1010 certified arrestor, the LF15M2 and SS series are certified.

Is it lead-free / potable safe?

Yes. The LF150A 1/2 is certified lead-free: its wetted surfaces meet the 0.25% weighted-average lead limit of the U.S. Safe Drinking Water Act, so it is approved for potable water in all states.

Does it need recharging?

It can be. The LF150A 1/2 is a tank-type arrestor, factory pre-charged to 30 psi, and its air chamber is rechargeable in the field through a standard tire valve under the sealing cap — so a unit that has become waterlogged can be restored rather than replaced. Shut off and drain the line before recharging.

Specifications

• Connection: MNPT
• Connection Gender: Male
• Seat / Seal Material: Rubber
• Max Pressure (psi): 150
• Application: Domestic Water
• Pack Quantity: 12
• Country of Origin: United States
• Warranty: 1 Year Limited
• MPN: LF150A 1/2
• Temperature: up to 180°F
• Lead-Free: Yes
• Accessory Type: Water Hammer Arrestor
• Body Style: Tank