RM66 Robert Manufacturing 1/4" Compression Bobby Brass Float Valve Assembly The Bobby Series Valves are miniature float valves. They come standard with a nitrile plunger seal and feature a standard 1/8” orifice size. Construction: brass body, stainless steel seat, and a polyethylene float. Maximum temperature is 175 degrees F. Overall length: 9-3/4”. Flow capacity: 1.31 GPM at 35 psi and 2.25 GPM at 85 psi. Maximum inlet pressure: 125 psi. The inlet connection is 1/4” compression for 1/4” OD tubing.