£42.95

Master Lock Trailer Lock, Trailer Coupler Lock, Fits 2-5/16 in. Couplers, 378DAT

Silver, 378DAT

Price data last checked 62 day(s) ago - refreshing...

View at Amazon

Price History & Forecast

Last 29 days • 29 data points (No recent data available)

Historical
Generating forecast...
£75.05 £39.74 £47.44 £55.15 £62.85 £70.56 £78.26 21 January 2026 28 January 2026 04 February 2026 11 February 2026 18 February 2026

Price Distribution

Price distribution over 29 days • 3 price levels

Days at Price
1 day 21 days 7 days 0 5 11 16 21 £43 £74 £75 Days at Price

Price Analysis

Most common price: £74 (21 days, 72.4%)

Price range: £43 - £75

Price levels: 3 different prices over 29 days

Description

The Master Lock No. 378DAT features a 2-5/16 inch (59mm) trailer coupler lock, designed to resist rust and corrosion. The advanced locking mechanism provides resistance to picking and prying. The Limited Lifetime Warranty provides peace of mind from a brand you can trust.Advance locking mechanism resists picking and prying

Key Features

Coupler lock is best used for trailers; Works best with Straight Tongue Trailer Couplers

Advance locking mechanism resists picking and prying

Designed to resist rust and corrosion

Fits most couplers 1-7/8 in. (48 mm), 2 in. (51 mm) and 2-5/16 in. (59 mm); Does not fit Gooseneck Trailer Couplers

Includes one trailer coupler lock, two keys

Product Specifications

Model
378DAT
Colour
Silver
Size
2-5/16-inch Couplers
Domain
Amazon UK
Release Date
11 April 2025
Listed Since
01 January 2011

Barcode

No barcode data available

Similar Products You Might Like

Master Lock Trailer Lock, Trailer Coupler & Receiver Lock Combo Pack, 3794DAT
96% match

Master Lock Trailer Lock, Trailer Coupler & Receiver Lock Combo Pack, 3794DAT

Master Lock

£47.48 04 Mar 2026
Master Lock 3895DAT - Coupler Lock, Receiver Lock and Latch Lock - 3 Components Keyed Alike
95% match

Master Lock 3895DAT - Coupler Lock, Receiver Lock and Latch Lock - 3 Components Keyed Alike

Master Lock

£73.95 18 Mar 2026
Master Lock 1471DAT Trailer Coupler Latch Lock, 3-1/2" Long Shackle x 9/32" Diameter Pin Silver, Fits UFP and surge brake couplers
95% match

Master Lock 1471DAT Trailer Coupler Latch Lock, 3-1/2" Long Shackle x 9/32" Diameter Pin Silver, Fits UFP and surge brake couplers

Master Lock

£36.36 05 Feb 2026
Master Lock 1481DAT Stainless Steel Barbell Receiver and Adjustable Coupler Lock Set
93% match

Master Lock 1481DAT Stainless Steel Barbell Receiver and Adjustable Coupler Lock Set

Master Lock

£49.03 19 Feb 2026
Proven Industries Model 2178 Trailer Lock, Fits 2-Inch Trailer Couplers, Secures Safety Chains, Made in The USA, (Blue)
92% match

Proven Industries Model 2178 Trailer Lock, Fits 2-Inch Trailer Couplers, Secures Safety Chains, Made in The USA, (Blue)

Proven Industries

£254.39 14 Jan 2026
AMPLOCK U-BRP2516 RV/Trailer Coupler Lock (fits 2 5/16 inches Ball Coupler with Straight Lip only) | Made in Canada
92% match

AMPLOCK U-BRP2516 RV/Trailer Coupler Lock (fits 2 5/16 inches Ball Coupler with Straight Lip only) | Made in Canada

AMPLOCK

£259.98 16 Dec 2025
CURT 23527 Trailer Lock Set for 2-Inch Receiver, 2-1/2-Inch Coupler Latch Span
91% match

CURT 23527 Trailer Lock Set for 2-Inch Receiver, 2-1/2-Inch Coupler Latch Span

CURT

£40.22 16 Dec 2025
Blaylock American Metal TL-33 Coupler Lock
91% match

Blaylock American Metal TL-33 Coupler Lock

Blaylock American Metal

£51.79 20 Feb 2026
AMPLOCK U-BRP2 | Heavy Duty Trailer Lock for 2" Ball Coupler | Patented 2-Parts Lock for Trailers, RVs, and Boats | Fits 2" Ball Trailer Coupler with Flat Lip Design
91% match

AMPLOCK U-BRP2 | Heavy Duty Trailer Lock for 2" Ball Coupler | Patented 2-Parts Lock for Trailers, RVs, and Boats | Fits 2" Ball Trailer Coupler with Flat Lip Design

AMPLOCK

£241.99 28 Jan 2026
Tow Ready (63228 'Gorilla Guard' Coupler Lock for 2" Couplers,silver
91% match

Tow Ready (63228 'Gorilla Guard' Coupler Lock for 2" Couplers,silver

Draw-Tite

£12.56 18 Mar 2026
CURT 25135 Straight Tongue Trailer Coupler for 2-1/2-Inch Channel, 2-In Hitch Ball, 3,500 lbs, CLEAR ZINC
91% match

CURT 25135 Straight Tongue Trailer Coupler for 2-1/2-Inch Channel, 2-In Hitch Ball, 3,500 lbs, CLEAR ZINC

CURT

£46.98 02 Mar 2026
CURT 25100 Straight Tongue Trailer Coupler for 3-Inch Channel, 2-In Hitch Ball, 5,000 lbs
91% match

CURT 25100 Straight Tongue Trailer Coupler for 3-Inch Channel, 2-In Hitch Ball, 5,000 lbs

CURT

£48.48 07 Feb 2026
Master Lock MASTERLOCK 2848DAT Receiver Lock for 1/2" and 5/8" Receivers
90% match

Master Lock MASTERLOCK 2848DAT Receiver Lock for 1/2" and 5/8" Receivers

Master Lock

£42.58 18 Feb 2026
AMPLock U-TLS2 : 2'' RV Lock/Trailer Coupler Lock/Boat Trailer Lock (fits on Specific 2 inches Coupler only)
90% match

AMPLock U-TLS2 : 2'' RV Lock/Trailer Coupler Lock/Boat Trailer Lock (fits on Specific 2 inches Coupler only)

AMPLOCK

£107.46 28 Jan 2026
CURT 25217 Black A-Frame Trailer Coupler, 2-Inch Hitch Ball, 7,000 lbs
90% match

CURT 25217 Black A-Frame Trailer Coupler, 2-Inch Hitch Ball, 7,000 lbs

CURT

£87.09 20 Jan 2026
CURT 25329 Channel-Mount Adjustable Trailer Coupler, 2-5/16-Inch Hitch Ball, 12,500 lbs
90% match

CURT 25329 Channel-Mount Adjustable Trailer Coupler, 2-5/16-Inch Hitch Ball, 12,500 lbs

CURT

£99.61 03 Mar 2026