Interpretation ID: nht75-3.40

DATE: 06/01/75 EST

FROM: AUTHOR UNAVAILABLE; R. B. Dyson; NHTSA

TO: Floyd, Kramer & Lambrecht

TITLE: FMVSS INTERPRETATION

TEXT: This responds to your letter of April 25, 1975, concerning the applicability of Federal Motor Vehicle Safety Standard No. 106-74, Brake Hoses, to the Wabco Westinghouse Duo-Matic Coupler.

You have described the Coupler as a device which replaces the glad hand coupler now used by most manufacturers to connect truck tractor and trailer brake lines. Because the brake hose which attaches to the Coupler is equipped with its own end fittings, the Coupler itself is not an end fitting. Therefore, Standard No. 106-74 is inapplicable.

The Coupler is, however, subject to the requirements of 49 CFR Part 393.45 and 393.46, of which I have enclosed a copy. Please direct any questions you may have concerning interpretation of these requirements to the Office of the Chief Counsel, Federal Highway Administration, at 400 Seventh St., S.W., Washington, D.C. 20590.

YOURS TRULY,

DOUBLE QUICK-RELEASE COUPLING DUO-MATIC "SEMTRA" FOR SEMI-TRAILERS

DUO-MATIC "SEMTRA" is a compressed air brake coupling for fitting on semi-trailers.

* No possibility of confusing the lines when connecting up.

* Simple to fit with or without attaching plate.

* Cover closes automatically -- no lost covers.

* Valves placed in the hose part.

* Takes up little room.

Ordering example: 452 803 500 0 Trailer part and towing vehicle part.

452 805 000 0 Towing vehicle part

For other combinations, see table.

PATENTED TRAILER PART TOWING VEHICLE PART TRAILER PART ASSEMBLY NO. ASSEMBLY NO. TOWING VEHICLE PART ASSEMBLY NO. 452 803 000 0 452 805 000 0 452 803 500 0 [Graphics omitted]

TOWING VEHICLE PART 452 805 000 0 Item Qty Part No. Description 1 1 152 805 230 1 Hose connection 2 2 896 010 680 1 Valve spring 3 2 152 802 190 1 Valve cap 4 2 897 181 100 1 Cylinder seal 5 2 805 070 430 1 Dished washer 6 2 810 518 018 1 Locking ring 7 2 899 504 400 2 Valve assembly 8 1 452 801 650 1 Dust cover 9 1 896 200 710 1 Spring 10 1 892 222 200 1 Shaft

Part marked x are included in spare parts set. E Packenhen kompl. Best. no. 452 805 000 2

TRAILER PART 425 803 000 0 Item Qty Part No. Description 4 1 152 802 100 1 Bracket 5 2 152 803 230 4 Sleeve 6 2 891 500 451 1 Nut 7 2 895 110 750 4 Press ring 8 1 452 802 550 1 Bettom plate 9 1 452 802 610 1 Dog for cover 10 1 452 802 555 1 Upper cover 11 2 452 802 690 1 Shaft 12 4 895 222 330 1 Locking ring 13 4 152 802 710 1 Lever 14 1 152 802 553 1 Holding-down P.

15 1 800 200 700 1 [Illeg.] springs 16 1 896 010 690 1 Compr. spring

Part marked x are included in spare parts set. E Packehen kompl. Best. no. 152 803 000 2

FITTING OF DUO MATIC "SEMTRA" ON SEMI-TRAILER IN ACCORDANCE WITH AMERICAN METHODS

[Graphic omitted]