Mechanical Relay Board for VacuMaid / AstroVac P125, SR42 & MK-X Central Vacuums Charles These bags use the heart-shaped

These bags use the heart-shaped

A fresh pulley grips the belt again for full

The chrome-plated equivalent is Part #34540C

It seats in place as a direct replacement

it traps fine dust and allergens so they stay out of the exhaust air

Mechanical Relay Board for VacuMaid / AstroVac P125, SR42 & MK-X Central Vacuums Charles These bags use the heart-shapedThis mechanical relay board (Part #P12595A) is a replacement low voltage control board compatible with VacuMaid and AstroVac central vacuum power units. The relay board energizes the high voltage motor circuit in response to the low voltage start stop signal from your wall inlets and hose handle. It is designed for the P125 power unit and the MK X series. Note that the SR42 unit uses two of these relay boards, so order a pair if you are servicing an