Official ordering-code profile 21000-28-05-00-035-01-02 Bently Nevada 21000 aluminum proximity probe housing assembly configured for a 3300 XL 8 mm probe. 3300 XL 8 mm probe 0.5 m cable 3.5 in penetration 3/4-14 NPT mounting Configuration at a glance This exact ordering code defines an aluminum 21000 housing body with a 304 stainless steel sleeve, a 3300 XL 8 mm probe option, 0.5 m probe cable, no standoff adapter, 3.5 in (88.9 mm) penetration, one 3/4-14 NPT fitting and plug