Jacobus Steam Vent Model 6 1/4" Straight

I been using these steam valves for years with no problems. This one is to replace failing valve on upstairs radiator, well its more of a restocking of the one i already used. I like keeping replacement ones on hand just in case because they will fail one day and much better to keep on hand than run out only to find your size isn't available. Can't depend on home improvement stores having them on hand mostly they don't and buying from plumber ouch $$$$.