Brass body with automatic air vent containing pinned float - Rotating collar allows use with horizontal or vertical pipe - Peroxide cured EPDM seals - Type 304 stainless steel internal mesh element - Polypropylene float - Stainless steel float linkages and float guide pin - 1/2 inch female bottom outlet for drain - 150 PSI maximum working pressure - 32 degrees to 250 degrees maximum working temperature range - Up to 50 percent maximum glycol antifreeze - 100 percent air separation removal to micro-bubble level