The Guardian Equipment AP620-101V is a 1/2" IPS stainless steel stay-open ball valve with flag handle and is a replacement part for Guardian Equipment eye and face wash units which have the eye wash valve oriented vertically such as the G1562 portable eye wash. Most models using the vertical valve are not 100% stainless so the chrome-plated brass AP600-101V is usually sufficient.
Portable eye washes such as the G1510, G1512, and G1562 models use this valve (note: the G1510 and G1512 are now obsolete) as do deck-mounted models such as the G1755, G1806, G1808, and G1822. Deck-mounted drench hoses such as the G5028 and G5300 also use this valve. Almost all other non-deck mounted Guardian models utilize the horizontal valve, AP620-101H.