i can't get the valve unit assembly out to replace the back o rings.s 2497 and 98 unit part #'s.i pulled the handles,unscrewed the cap but i am afraid to force the assembly out.it appears to have a notch at the bottom and top of the housing where the valve unit fits.should the assembly just pull straight out or is there a tool.my outside shower unit just pulls straight out.if i decide to replace everything with a newer unit can i still use the same housing.everything is in rough shape.it's been in there since 1967 and sears told me they no lomger make anything i have in plumbing in this house.
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