Apollo Stainless Steel POP Safety Relief Valve, MNPT Inlet Type, FNPT Outlet Type 543EEBKMAA0300 Length 12" even in areas with forklift even in areas with forklift traffic Contains 1000 gallon fuel tanks1 piece molded polyethylene design will not rust or corrodeNestable design saves freight and minimizes storage spaceOptional 3 4 drain fitting available allows use with Ultra SelfBailer2 drain fitting also availableUse with optional Ultra Self Bailer (Part# 9935) for outdoor containment Self Bailer allows clean stormwater to passively drain from sump while capturing hydrocarbons This safety relief valve features a full nozzle design It also features metal to metal seating and is ideal for pressure vessels and pressure piping systems