RC-Engines RC-Engines accessories OS-motorer Micture Control Valve. OS 21XZ-B Speed II Watch this product and we will notify you once it is back in stock. The product is now watched We will notify you once the product is back in stock again. E-mail Watch this product Your personal information is processed in accordance with our privacy policy. Micture Control Valve. OS 21XZ-B Speed II Micture Control Valve OS 21XZ-B Speed II. Share Reviews Product review Based on 0 ratings. Click on a star to rate 1 star 2 stars 3 stars 4 stars 5 stars You Click on a star to rate Retrieve your Facebook profile. Be the first to leave a review.