Diffusion Pump Heater NOS! Bobe’ 110v 400w 4”. New old stock dif pump heating element! 4 inch diameter. Please note that we have 2 of these available at the time of creating the listing, the differ slightly in appearance but have identical specifications. If both are available at the time of ordering you are welcome to message us with a preference, we intend to update the listing once one sells. Happy to combine shipping with other listings and offer discounts for multiple items!