S&S Newstar S-9976 Unloader-Regulator Valve

my unloader valve is a DR3550. will the DR3500 work as a replacement?

One of our suppliers lists this Knorr part number as a cross reference for their aftermarket replacement. We do not have any information on the DR3550

I am looking for a Wabco 975-303-065-0 unloader valve. Can the 9753034730 valve be used in place of the 975-303-065-0. If not do you carry one that will.

They said there wasn’t a replacement but you can try calling 855-228-3203 and listen to the prompts .

Do you have a manual for this unloader. I would like to know if the operating pressure increases when the tyre inflation hose is installed. For my application (mercedes O309) the unloader set point changes(increases) when the inflation hose is installed. Do you also have a listing for the hose that fit the valve?

Our Sales team found this snippet: Unloader 975 303 473 0 Repair Safety Hints: Before dismounting and starting any repair activities, please refer to the vehicle manufacture`s documentation. With the General Repair and Test Hints you will learn more about safe repair. Unloader 975 303 473 0 Repair Specific repair information (adapted spare-parts and repair kits) for this device can be inferred from the Spares Parts List 9753034730. Unloader 975 303 473 0Testing: If an instruction for testing is not available, please use technical specifications stated in outline drawing. Unloader 975 303 473 0 Test equipment: For testing of pneumatic devices please use the WABCO-test bench or a comparable testing equipment. Hint: After fitting the repaired device to the vehicle the complete system is to be tested according requirements of the national regulations and the vehicle`s manufacturer. Unloader 975 303 473 0 Technical Sheet 1. Cut-out pressure: 8.1±0.2 bar 2. Operational range: 0.6+0.4 bar 3. Temperature range: -40° ... +150°C 4. Port threads: M 22x1.5 5. Safety Valve: 12.0+2 bar 6. 22 For other uses: closed; M 12x1.5 7. Tyre inflation 1-2: available 8. Port 23 for air dryer: without

Good morning,I am looking for a very similar item, but my old one have a partially different number Wabco 975-303-503-0. Do you have the correct item? Otherwise, are the two item interchangeably?Moreover, if there are problems, could I ask the sostituion or the return and refund?Thanks in advance

Unfortunately, we do not carry that part number and they are not interchangeable. Good luck in your hunt and have a pleasant week!