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Demco Surge Coupler (Bulldog Head)

TextModel DA91 is a heavy duty surge brake actuator for trailers with two or four wheels. When brakes are applied on the towing vehicle, forward inertia of trailer toward towing vehicle applies brakes on trailer in direct relation to manner brakes are applied on towing vehicle. Brake towing vehicle hard and brakes on trailer are applied hard. Master cylinder push rod spring assembly protects system from hydraulic pressure overload.
Part #
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Description |
21-111 |
Demco 2" Surge Coupler (Bulldog Head) - 7000 lbs. |
21-112 |
Demco 2 5/16" Surge Coupler (Bulldog Head) - 7500 lbs. |
Demco DA10 Surge Coupler

Part #
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Description |
21-406 |
Demco DA10 Surge Coupler w/ Levelor Channel - 10K (requires adj. coupler head) |
21-406-A |
Replacement Master Cylinder Kit - Includes Gasket, Bolts, & Boot |
21-406-B |
Replacement Master Cylinder Cap - Includes O-Ring |
21-303 |
Bolt & Nut (2 required) |
Atwood Surge Coupler

Atwood Hydraulic Surge Brakes add safety and convenience to trailer towing. Less complicated than other systems, the Atwood brake system provides such benefits as no "in car" hook up, no hand controls, and no special car to trailer wiring. These features, plus automatic braking, smooth performance and simple operation are combined to provide a low cost, convenient brake system.
Part #
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Description |
21-200-Disc |
2” Atwood Surge Coupler - 6,000 lbs. capacity - Disc |
21-200 |
2” Atwood Surge Coupler - 6,000 lbs. capacity |
21-200-8K |
2” Atwood Surge Coupler - 8,000 lbs. capacity |
21-200-A |
Replacement Master Cylinder Only |
21-200-C |
Replacement Filler Cap Only |
21-200-G |
Replacement Shock Only |
21-200-B |
Master Cylinder Repair Kit |
Balcrank


Part # |
Description |
21-405 |
Balcrank 6K w/Leveler Channel (Bolt On) |
Titan MD-60

The Titan MD-60 coupler has a 6,000 pound capacity (max. G.V.W.R.) and 600 pound tongue load. It is designed for a 3” wide trailer tongue. The unique adjustable feature allows it to fit either an 1 7/8” ball or a 2” ball.
Part #
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Description |
21-410 |
Dico Model 60 Multi-fit Surge Coupler (1 7/8’ - 2” ball) |
21-411 |
Replacement Multi-fit Repair Kit Only |
21-412 |
Replacement Lever Lock Repair Kit Only |
21-306 |
Replacement Master Cylinder Kit Only |
21-306-2 |
Replacement Master Cylinder Repair Kit Only |
21-307 |
Replacement Filler Cap Only |
21-308 |
Replacement Shock Only |
Titan MD-10

 
Part #
|
Description |
21-400 |
Dico Model 10 Surge Coupler w/ 2 5/16” Head - 10K |
21-401 |
Dico Model 10 w/ Leveler Channel |
21-305 |
Replacement Master Cylinder Rebuild Kit (MD10/20) |
21-305-1 |
Replacement Master Cylinder Only (MD10/20) |
21-320 |
2 5/16” Coupler Repair Kit Only (MD10) |
21-414 |
Replacement Shock Only (MD 10) |
21-321 |
Replacement Filler Cap & Gasket Only (MD10) |
21-309 |
Replacement Cover (MD10) |
Titan MD-20

Part #
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Description |
21-300 |
Dico Model 20 Surge Coupler w/ Channel (20,000 lbs.) |
21-300-1 |
Dico Model 20 Surge Coupler w/ Pintle Ring (20,000 lbs.) |
21-300-2 |
Dico Model 20 Surge Coupler w/ 2 5/16” Head (20,000 lbs.) |
21-300-3 |
Dico Model 20 Surge Coupler w/ no Head (20,000 lbs.) |
21-305 |
Replacement Master Cylinder Rebuild Kit (MD10/20) |
21-305-1 |
Replacement Master Cylinder Only (MD10/20) |
21-310 |
Replacement Shock (MD20) |
21-321 |
Replacement Filler Cap & Gasket Only (MD20) |
21-309 |
Replacement Cover (MD20) |
Head Assembly

This coupler can either be used in conjunction with the surge couplers above or with the leveling channel . G.V.W.R. 12,000 lbs.

Part #
|
Description |
21-302 |
2 5/16” Head Assembly |


Designed for "tag along" trailers used primarily in the construction business,
BULLDOG forged adjustable couplers allow level towing behind a variety of towing vehicles.
The height of the trailer tongue may be quickly adjusted to match the height of the hitch ball for safer, smoother towing. Couplers fit inside a 2 7/8" wide channel. For leveling channels, see below.
Part # |
Description |
21-302-4 |
2" Adjustable Forged Head - (7K) |
21-302-3 |
2 5/16" Adjustable Forged Head - (12.5K) |

- Unique cast steel shield prevents damage to coupler latching mechanism
- Patented Wedge-LatchT design act like a vise, keeping the trailer ball locked in the ball pocket
- Hardened steel field serviceable ball clamp provides years of trouble free towing and eliminates need to replace coupler
- Fast, convenient latching simplifies hook-up and saves time. No more fighting calm shell style latching mechanisms
- Rust resistant grey dip primer ensures total coverage and excellent corrosion resistance
Part # |
Description |
21-302-6 |
2 5/16" Adjustable Cast Head - (14K) |
Note: Bolts and nuts included. For leveling channels, see below.

Capacity: 2,000 lbs. maximum vertical load / 12,000 lbs. M.G.T.W.
3" I.D. eye 1-9/16" eye section.
Part # |
Description |
21-301 |
Buyers 3" Pintle Ring Assembly |
Leveling Channel
 
Part # |
Description |
21-304 |
4-Hole Leveler Channel |
21-430 |
6-Hole Leveler Channel w/Gussets |
21-303 |
Bolt & Nuts (2 required) |
21-430-1 |
6-Hole Leveler Channel w/o Gussets |
Hydraulic Lock-Out Solenoid

When installed between the hyd. surge coupler and the brake line, it makes it possible to back-up without activating the brakes.
Part # |
Description |
18-976 |
Hyd. Brake Lock Out Solenoid |
Hydraulic Line Kit
 Used to hook hydraulic actuators to hydraulic braked axles.
Part # |
Description |
21-500 |
Single Sprung Axle Plumbing Kit |
21-501 |
Single Torflex Axle Plumbing Kit |
21-501-1 |
Single Torsion Line Kit |
21-600 |
Tandem Sprung Axle Plumbing Kit |
21-601 |
Tandem Torflex Axle Plumbing Kit |
2 5/16" Adj. Cast Head Coupler - 2 5/16" Adjustable Cast Head - (14K) (SKU: 21-302-6)
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2 5/16” Adj. Forged HeadCoupler - Bulldog 12.5K (SKU: 21-302-3)
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2 5/16” Coupler - Buyers - 12K (SKU: 21-302-1-Kit-Buyers)
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2 5/16” Coupler - Buyers- 12K (SKU: 21-302-1)
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2 5/16” Head Assembly 12K (SKU: 21-302-T-Kit)
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2 5/16” Head Assembly 12K (SKU: 21-302)
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2" Surge Coupler - Atwood (8K) (SKU: 21-200-8K)
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2” Adj. Forged Head Coupler - Bulldog, 7K (SKU: 21-302-4)
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2” Coupler - Buyers, ADJ COUPLER HEAD 2" BUYERS 10K (SKU: 21-302-2-Kit-4H)
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2” Coupler - Buyers, ADJ COUPLER HEAD 2" BUYERS 10K (SKU: 21-302-2)
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2” Surge Coupler - Atwood (SKU: 21-200)
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2” Surge Coupler - Atwood / 9050008 (SKU: 21-200-Zinc)
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3” Pintle Ring -12K Buyers (SKU: 21-301)
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4-Hole Leveler Channel... Heavy Duty Steel Construction / 8978 (SKU: 21-304)
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6-Hole Leveler Channel, LEVELER CHANNEL 6-HOLE W/GUSST (SKU: 21-430)
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6-Hole Leveler Channel, (8978XL) LEVELER CHANNEL 6-HOLE NO GUSSETS (SKU: 21-430-1)
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6K w/ Leveler Channel - Balcrank, 6K SURGE COUPLER W/CHANNEL BALCRANK , (Bolt-On) (SKU: 21-405)
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7k 2” Forged Coupler w/Bolts & Nuts (CTA190) (SKU: 21-302-4I)
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Bolts/Nuts - (Titan Brand) (SKU: 21-303)
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Bolts/Nuts, (SKU: 21-303-1)
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Demco 2 5/16” Surge Coupler - Bulldog (SKU: 21-112)
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Demco 2” Surge Coupler - Bulldog, (SKU: 21-111)
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DEMCO DA9150 8K ACT W/2" ADJ BULLDOG 7K CPLR,DRUM (SKU: DA9150-2HBC)
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Lever Repair Kit - Titan (SKU: 21-412)
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Master Cylinder Rapair Kit, Atwood (SKU: 21-200-B)
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MD-10 Surge Coupler - Titan, SURGE ACT DICO MD10 W/2 5/16" 16075 *INCLUDE PRODUCT MANUAL (SKU: 21-400)
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MD-10 Surge Coupler - Titan, SURGE ACT DICO MD10 W/CHANNEL *INCLUDE PRODUCT MANUAL (SKU: 21-401)
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MD-20 Surge Coupler - Titan (SKU: 21-300)
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MD-20 Surge Coupler - Titan, Dico Model 20 Surge Coupler w/ 2 5/16” Head (20,000 lbs.) (SKU: 21-300-2)
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MD-20 Surge Coupler - Titan, Dico Model 20 Surge Coupler w/ no Head (20,000 lbs.) (SKU: 21-300-3)
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MD-20 Surge Coupler - Titan, Dico Model 20 Surge Coupler w/ Pintle Ring (20,000 lbs.) (SKU: 21-300-1)
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Pintle Ring Assembly 12K Adj. BUYERS (SKU: 21-301-B-12K-KIT)
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Pintle Ring Assembly 20K Adj. WF (SKU: 21-301-HD-WF-KIT)
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Pintle Ring Assembly 20K Adj. WF RN# 16137 (SKU: 21-301-HD)
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Repair Kit - Titan (SKU: 21-411)
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Replacement Filler Cap (SKU: 21-200-C)
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Replacement Shock, SHOCK FOR ATW 2"SURGE COUPLER (SKU: 21-200-G)
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Shock - Titan (SKU: 21-414)
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Single Spring Plumbing Kit (SKU: 21-500)
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Single Torflex Plumbing Kit (SKU: 21-501)
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Single Torsion Line Kit (SKU: 21-501-1)
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Surge Coupler - Titan, SURGE COUPLER DICO MD 60 2" MF (8605101 ) *INCLUDE PRODUCT MANUAL RN (8605001) DISC "6K" 3"TONGUE (SKU: 21-410)
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Note: All prices in US Dollars
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