Replacement Switch for LaSalle Bristol Motodrain Electronic Waste Valve

Updated 09/15/2026 | Published 09/07/2026

Question:

I have this valve and the switch has went bad. Is there a replacement switch for this that I can buy? It’s a 3 position 7 blade switch. Laselle says the switch part number is 90MVRS but I tried searching and have had no luck finding just the switch.

asked by: Jon H

Expert Reply:

Hey Jon! We don't currently carry the replacement 90MVRS switch by itself, and I haven't been able to find it available separately anywhere else either. Did LaSalle Bristol happen to say anything about aftermarket availability when they gave you that part number? I submitted the information to add it to our site, but it may not be something LaSalle Bristol makes available for us to carry separately.

expert reply by: Robin H

Jon H.

9/11/2026

Hi Robin, yes Laselle did say in the email to contact either etrailer or recpro for a new switch and they gave that part number for reference. Does etrailer have any kind of aftermarket switch? I can forward the email to you if you want.

Robin H.

9/11/2026

@JonH no that is fine. I don't think we have an aftermarket that will work with that based on that wiring harness. I submitted the information earlier with the part number you gave me. Since it is Friday, the odds of it getting added today are slim. Hopefully early to mid next week we will have it and I'll update you here. We have to get more information from the manufacturer as well before it can be added to the site.