Are you using Walthers Proto passenger cars to represent your favorite prototype in use today?  Chances are that the modern day car uses tube diaphragms instead of the plate type standard on the Walthers car.

Our replacement tube diaphragms are available as a single pair, or in a bulk pack of 20, with Black, UP Grey, and Silver bases to match almost every paint scheme in service today.  All diaphragms come assembled as shown above.  The tubing is flexible and the existing Walthers couplers will work on curves down to about 28-30 inches.  For tighter curves, you may need to use a long shank coupler.  Compatable on Walthers ACF and PS Proto passenger cars.  Will NOT work on Walthers Budd cars.

Just remove the existing plate diaphragm from your Walthers Proto car, then glue your new tube diaphragms in place with a small amount of medium CA.  The base of the diaphragm is available in Black, Silver, and UP Grey.  The tube color is Black on all versions.

You can have your modernized passenger car looking right in about 20 minutes!


Single Pair – $8.50

10 Pair Bulk Pack – $75

Please note which diaphragm base color you want when ordering – Black, UP Grey, and Silver

To purchase any of our products, please send an email to stating the product(s) you want and provide your shipping address.  We will send you a PayPal invoice with the product(s) and shipping total.  US domestic orders will ship USPS First Class or Priority mail if over 16 oz.  For international orders, we will provide you a quote using USPS International Mail, or Fed Ex/UPS if you prefer those carriers, prior to sending the PayPal invoice.  As we tend to have a backlog of orders, we will provide you the estimated ship date at the time of your request.