PneumaticPlus DK4000 Replacement Diaphragm for SAR4000 & SAR400 Regulator

Fast shipping and correct part. So glad they had this. Thank-you will be purchasing more parts.

I am impressed with pneumatics plus customer service. They know their products and what’s needed to solve problems including having parts for 11 year old regulators in stock. I will continue to buy their products. As a former facility manager of civil engineering at UC Berkeley it was my task to keep things running well, including fixing things in the testing lab. It’s very uncommon to call a suppliers for help with their products and actually talk with someone who not only knows their products, but continues to carry parts to service them. Thanks Pneumatic plus for being a reliable seller of quality products and knowing your product line including servicing them.You have my continued support.

WORKS GREAT

Seems like it costs just a little too much, and shipping too, but it fixed the problem. Same thing happened 5 years ago, so this is the 3rd time. Rubber at the periphery seems to thin out and fail, it starts leaking and won’t allow full pressure. I wish it was just $10 including shipping, but glad they're still available. This regulator is still the best and longest lasting one I’ve ever had. Homeowner use, not commercial, pump only runs every 2-3 weeks for a short period. I think the last time was warranty replacement and was free, but I can’t remember. Customer service is excellent on their website. The plastic knob also failed recently, so i was using a visegrip on the metal shank to turn pressure up and down. Replacement knob unit not worth the price. Then when I was replacing this I found the old knob assembly, so i switched that out too.

After speaking to a tech, this was my solve. Unit works perfect again. Fast shipping and very happy. Thank you!

The diaphragm in pressure regulator failed after many years of use. Contacted Pneumatic Plus. Answered a couple questions and they were able to determine replacement part needed. Parts arrived on time. Back in business! Thanks Don

Had a PneumaticsPlus regulator in service for many years. Occurred a slight leak and contacted customer service. He directed me on ordering an exact replacement diaphragm and unit works flawlessly again. Outstanding customer service. Highly recommend PneumaticPlus products.