Williams P285500 Push Button

is this all I need to replace spark ignitor for williams model #5009822 double sided thanks your # p285500

Here are the parts for 5009822: Part# P322396, P322155 and P285500.

Red push button on my williams wall heater, is it to turn pilot light on?

It is for use on an ignitor. Please reply with your unit model and serial numbers so we can check if this fits your model. Thank you.