This WUR is very simple in design and has no internal diaphrams. It is also quite short compared to the other types. No instructions are included, but they are readily available on the internet by doing some google searches. Study the two pictures below to make sure you have this one on your engine.
Product Details
WARNING. After you install these new parts you will need to adjust the regulator on the engine while running. There is no way you can do this without a good accurate fuel pressure testing gauge for Bosch CIS fuel injection. See related products below.
Related Products:
K-jet Warm Up Regulator Modification: External Pressure Adjustment - On Demand Video
This xx minute video will take you step by step through the process of modifying your warm up regulator so you will be able to easily make adjustments to your cold start control pressure.
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You will find the quality of this kit is impressive and it has things in it that other kits do not have. No instructions included, but you can find instructions online if you search for them. WARNING.
1976 to 1995 Fuel Injection Pressure Tester - Basic Kit - Ready to Use
This tester is a "must have" if you want to work on and troubleshoot the fuel injection system on your 30-year older gas fuel injected Mercedes engine. Let's face it. Thirty years is old, but 55 years is ancient. You can not fix the system if you don't know what it is doing!