Instructions / Assembly

Recommended Installation
Basic Construction
** Balancing valve should be installed in cold water line to hot water extender
tempering valve, as shown, to help compensate for pressure drop through heater.
† Note: Valves listed to ASSE Standard 1016 such as Watts model LFMMV, LFL111
or LFUSG should be used at fixtures to prevent possible injury.
Dimensions – Weight
Dial
Adjustment
Cap
Replaceable Thermostat
interchangeable in all
four models
Sweat or
Threaded
Connections
Lead Free*
Brass Body
Heavy Stainless
Steel Spring
Watts Vacuum
Relief Vacuum
Cold
Watts T.&P.
Relief Valve
Drain
Tempered
LF70A
**
Hot to
Appliances
Water Heater
8" - 12"
(200 - 300mm)
Watts T & P Relief Valve
Drain
Hot
Water Boiler
Tankless Heater
Pressure relief
valve meeting
latest A.G.A.
Standard
Hot to
Appliances
Tempered
Hot
8" - 12"
(200 - 300mm)
Cold
Watts Check Valve
LF70A
**
▼
▼
▼
▼
▼
▼
▼
▼
▼
▼
▼
▼
▼
▼
▼
▼
▼
▼
▼
▼
▼
▼
kPa psi
69 10
62 9
55 8
48 7
41 6
34 5
28 4
21 3
14 2
7 1
0 0
0 1 2 3 4 5 6 7 8 9 10 gpm
0 4 8 11 15 19 23 27 30 34 39 lpm
1
⁄2"
3
⁄4"
Flow
Pressure Drop
∆P
†
†
D
*
A
B
ES-LF70A 2026 © 2020 Watts
USA: T: [phone] • F: [phone] • Watts.com
Canada: T: [phone] • F: [phone] • Watts.ca
Latin America: T: (52) 81-1001-8600 • Watts.com
NEED FOR PERIODIC INSPECTION
Periodic inspection by a licensed contractor is recommended.
Corrosive water conditions, temperatures over 210°F (99°C),
unauthorized adjustments or repair could render the valve inef-
fective for service intended. Regular checking and cleaning of
thermostat assembly helps to assure maximum life and proper
product function. Frequency of cleaning depends upon local
water conditions. *See Warning on reverse side.
CAUTION
!
S
MODEL SIZE CONNECTION DIMENSIONS WEIGHT
A B D *
in. in. mm in. mm in. mm in. mm lbs. kg
LF70A-F, LFL70A-F
1
⁄2 Sweat 2
1
⁄32 52 3
11
⁄16 94 2
3
⁄16 56
15
⁄16 24
3
⁄4 .3
LF70A-T, LFL70A-T
1
⁄2 Threaded 2
7
⁄16 62 3
7
⁄8 98 2
21
⁄32 67
15
⁄16 24 1 .5
LF70A, LFL70A
3
⁄4 Sweat 2
3
⁄4 69 4
1
⁄8 105 2
27
⁄32 72 1
3
⁄32 28 1 .5
LF70A-T, LFL70A-T
3
⁄4 Threaded 2
3
⁄4 69 4
1
⁄8 105 2
27
⁄32 72 1
3
⁄32 28 1
1
⁄4 .6
Capacity
Standards
Listing: NSF 372