Watts LF8 User Manual

For Health Hazard Applications

ES-LF8

Job Name

Job Location

Engineer

Approval

LEAD FREE

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*

Series LF8

Hose Connection Vacuum
Breakers

Size: 3⁄4" hose thread

Series LF8 is a line of unique vacuum breakers specially made to
permit the attachment of portable hoses to hose thread faucets.
Designed to prevent the flow of contaminated water back into the
potable water supply, these devices require no plumbing changes
and screw directly onto sill cocks. The Series LF8 features Lead
Free* construction to comply with Lead Free* installation require­ments.

Series LF8 can be used on a wide variety of installations, such as
service sinks, swimming pools, photo developing tanks, laundry
tubs, wash racks, dairy barns, marinas and general outside gar­dening uses.

Contractor

Approval

Contractor’s P.O. No.

Representative

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LF8A

Non-Removable Model

LFNF8

Permits Manual Drain

8P

Tamper-Proof Feature

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LF8

LF8B

Features

• Copper silion alloy body (all models except 8P, which is plastic)

• Stainless steel working parts for longevity

• Durable rubber diaphragm and disc for

consistent positive seating

Models

LF8A - Furnished with exclusive “Non-Removable” feature and

standardly equipped to allow sill cock to be drained.

NOTICE

Device should only be installed on approved sill cocks
containing at least four full threads. Non-removable
once installed.

LF8 - Similar to the 8A except it is furnished without the
“Non-Removable” or draining feature. Secured with Allen

head set screw.
LF8B - Furnished with break-away set screw to provide a

tamper-resistant installation. Standardly equipped to allow
sill cock to be drained.

LFNF8 - Especially made for wall and yard hydrants. Permits man-
ual draining for freezing conditions.

8P - Furnished with exclusive patented “Non-Removable”
feature. Standardly equipped to allow sill cock to be drained.
Constructed of durable, corrosion-resistant, reinforced
thermoplastic. Tamper-proof feature.

LF8AC, LF8C or LF8BC - Same as above but furnished
with chrome finish.

LF8FR - With freeze relief feature.

LF8FR

NOTICE

Series LF8 is tested and certified under ANSI A112.1.3
(ASSE 1011), which precludes use under continuous pressure.

This valve should only be used in areas where spillage of
water will not cause damage.

3

Inlet Connection:
Outlet Connection:
Maximum Pressure: 125psi (8.6 bar)
Maximum Temperature: 180°F (82°C)

For backflow preventers for tub and shower hand spray sets,
request literature ES-S8.

⁄4" standard female hose thread

3

⁄4" standard male hose thread

Specifications

A hose connection type anti-siphon vacuum breaker shall be
installed where indicated on the plans to prevent the backsiphon­age of contaminated water. Lead Free* hose connection vacuum
breaker shall be constructed using Lead Free* materials. Lead Free
vacuum breaker shall comply with state codes and standards,
where applicable, requiring reduced lead content. This device is not
to be used under continuous pressure or where there is a possibil­ity that a backpressure condition may develop. This device shall

meet the requirements of ANSI A112.1.3, ASSE Standard 1011.

Vacuum breaker shall be a Watts Series LF8.

*The wetted surface of this product contacted by consumable
water contains less than 0.25% of lead by weight.

Watts product specifications in U.S. customary units and metric are approximate and are provided for reference only. For precise measurements,
please contact Watts Technical Service. Watts reserves the right to change or modify product design, construction, specifications, or materials with­out prior notice and without incurring any obligation to make such changes and modifications on Watts products previously or subsequently sold.

Capacity

Installations

kPa psi

276 40

241 35

207 30

172 25

138 20

103 15

Supply Pressure

69 10

35 5

0 1 2 3 4 5 6 7 8 9 10 gpm

0 3.8 7.6 11.4 15.1 18.9 23 27 30 34 38 lpm

**Performance as established by an independent testing laboratory.

Performance** Curve

Flow

Approvals

1011 B64.2

Series LF8, LF8A, LF8B, 8P, LF8FR and LFNF8 are listed by
IAPMO.

NOTICE

Inquire with governing authorities for local installation requirements

For Inside or Outside Use

Installation - Inside Service Sink

Hose Bibb

Vacuum
Breaker

What is Backsiphonage?

A reversal of normal flow in the system
caused by a negative pressure (vacuum
or partial vacuum) in the supply piping.

Hose Bibb

Vacuum Breaker

Drainage Features to Prevent Freezing

Models LF8A, LF8B, LF8FR and 8P hose connection vacuum

breakers are constructed to allow sill cocks to be drained. Simply
remove hose coupling and lightly pull knurled tip of stem at outlet
of valve to allow drainage of collected water.

Dimensions – Weights

B

A

MODEL SIZE DIMENSIONS WEIGHT

A B

In. In. mm In. mm oz. gm.

LF8, LF8C, LF8B, LF8BC 3⁄4 HT 11⁄2 38 13⁄8 35 4.0 113.4
LF8A, LF8AC 3⁄4 HT 11⁄2 38 11⁄2 38 4.0 113.4
LFNF8 3⁄4 HT 2 51 11⁄2 38 5.3 151.2
8P 3⁄4 HT 13⁄4 38 13⁄8 35 1.5 42.5
LF8FR 3⁄4 HT 13⁄4 38 13⁄4 38 7.0 200.0

NOTICE

Do not use Models LF8, LF8A, LF8B, 8P, LF8FR Hose Bibb
Vacuum Breakers on frost-free hydrants. Specify Model LFNF8.

Do not use where discharge
of water is objectionable.

A Watts Water Technologies Company

ES-LF8 1331 © 2013 Watts

USA: Tel: [phone] • Fax: [phone] • www.watts.com

Canada: Tel: [phone] • Fax: [phone] • www.watts.ca