UI Control Knob for PR System One REMstar Series CPAP & BiPAP Machines

UI Control Knob for PR System One REMstar Series CPAP & BiPAP Machines

4.83 Average Rating of 29 Reviews Read Reviews

  • MADE IN AMERICA! This product is one of the many products we offer that are proudly produced in the USA.
  • IN STOCK WITH FREE SHIPPING! This product is in stock and ready to ship. Buy today and we'll ship it free within the USA.


The System One UI Control Knob is dark, charcoal gray in color with a silver inlay around the rim. The sides of the knob are ridged to make them easy to grip.

COMPATIBILITY: This Control Knob comes standard with all "60 Series" System One CPAP & BiPAP machines -- REMstar Plus 260, REMstar Pro 460, REMstar Auto 560, BiPAP Pro 660, BiPAP Auto 760, etc. It can also be used to replace the lighter gray Control Knob found on all "50 Series" System One CPAP & BiPAP machines -- REMstar Plus 250, REMstar Pro 450, REMstar Auto 550, BiPAP Pro 650, BiPAP Auto 750, etc.

INSTALLATION: When an old UI Knob is removed or lost a small metal ring from inside of it can sometimes get stuck on your CPAP machine's knob post. If that ring is present the new UI Knob will not fit properly onto the post. To fit the new UI Knob properly remove the metal ring, either from the post or from inside the new knob, before inserting the new UI Knob onto the machine's knob post.

Product Information

  • Manufacturer Philips Respironics
  • Part Number(s) 1099581
  • HCPCS Insurance Code E1399
  • GTIN / UPC Code
  • Warranty 30 Days
    Warranty Notes: Warranty applies to primary item. Accessory and parts warranties may vary. Review manufacturer's documentation for full details.
  • Country of Origin United States of America (Typical)


Average Rating of
Total 29 Reviews
  • Fits great

    My old knob broke and needed replaced. It fits. ddgm23rd,

  • Perfect for our CPaP machine

    Thought we may have a hard time finding the knob after ours broke but found the exact knob for an excellent price. Shipping was speedy. Only positive comments because our shopping experience was very good!debnegri53,

  • Works Great

    Works just like the original PinoyMuscle,

  • Directions would have helped

    Got the part, on time and as expected. Looks just like the old one. Would have rated it a 5, except that I didn't get any installation instructions with the part. I did eventually find them online, and once I removed the nearly invisible portion of the old part, it worked fine. Matt,

  • Couldn't find this anywhere else!

    I couldn't find this knob for my CPAP machine anywhere else and DirectHome Medical had it at a reasonable price! Carl,

  • Prompt service...right part

    Prompt service and the right part; can't ask for more. An older C-PAP I use when traveling. I shoul have checked here first. J Nylund,

  • Replacement knob

    The knob arrived very promptly as promised. It was what I needed but I am having difficulty attaching it permanently. It's just sitting on top loose. Sandy,

  • Bob from Wisconsin

    The knob was just perfect!! They are made so cheap but what can you say !!Bob K,

  • Broken Part

    I ordered a replacement part for my CPAP. It arrived a day early and was the correct part. Jerry,

  • Knob review

    It's a Knob. What else can I say? Knob user,

  • Knob

    Was just what I was expecting, easy to replace as well Derek Wright,

  • My c pap

    Fit perfect Bill Raybold,

  • What a Knob

    First of all, I was delighted that the knob was available. My only problem was figuring out how to remove the clip to allow the new knob to be applied. I saw these reviews and took the advice and removed the clip from the post. (Was afraid of damaging the knob) With a little perseverance I finally succeeded in removing the pin. The knob then fit like a glove. anneRkissed,

  • Exact Knob

    The right knob for my machine. Had to remove old lock ring (as advised when purchased) from machine to attach new one. Machine User,

  • knob

    The knob doesn't fit properly on the stem and so it wobbles Tim,

  • Cpap machine control knob

    This item was received in a timely manner in good condition. It was the correct knob for my machine. Reasonably priced. Skeet,

  • It's a perfect replacement.

    I broke the original knob off and needed a replacement. After shopping around, this seemed to be the best value. I had a little difficulty removing the metal insert from the old broken knob out of the machine but once it was all removed this unit fit perfectly. Guy T,

  • Great service! Arrived sooner than expected. 😊

    I wish I had known about being able to buy this little piece for my CPAP. The knob broke off a year and a half ago. Then my CPAP provider said they didn't take care of stuff like that. So glad I found Direct Home Medical! DYS,

  • control knob

    Had to replace --this one fits well AJC,

  • parts

    lucky to find a knob for cpap machine at a reasonable price, shipping was prompt vern,

  • Perfect Replacement Knob

    After ordering the replacement it arrived within several days. The price isn't bad and the shipping is free! My old metal ring that is referenced in other reviews was the biggest issue. I was able to removed the old metal ring from the post with a small paper clip. I finally got leverage on the curved side of the post. There were a couple of indentations that turned out to be slits in the metal ring that allowed me to get the leverage. Overall, great experience! Hal,

  • Another good seller

    Quick, precise, and inexpensive. You just can't ask for more. Na,

  • Replacement knob

    Fit like new William,

  • Right Product

    Some how the knob on my machine broke. I looked at several websites but decided to purchase from Direct Home Medical for price. Shipping was within 24 hours of purchase and delivery within 72 hours, best service...BA Greene,

  • My supplier sent me to this website

    My BiPap supplier said they did not have the knob but gave me direct home medical's website address. Found what I needed quickly, the price was right and delivery was quick. Knob fit my System one machine perfectly. Wally H,

  • Cpap Control knob

    Exactly what I expected and quick shipping.Richard K,

  • Perfect!

    This knob worked perfectly to replace one broken on a plane trip. Make sure that the metal insert from the old knob is removed from the CPAP first so that the new knob will fit. Ed L,

  • Clearly OEM quality.

    Put it on. It works just like the original. Joe W,

  • Just what I needed

    The knob was an exact match, I couldn't get it on at first, then realized the metal sleeve from old knob was stuck on the shaft. It was a little tricky, but if you're having trouble installing this, most likely that's the problem. Service was excellent, received it in a few days. Bob,