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Square Manholes—FIG 424 and 524 Series <br />Square box to provide access to equipment etc. on driveway surface. <br />The Fig 424 is a knock -down style for service stations. Fig. 524 is a <br />remediation type manhole used for site clean-up. Bolt down, gasketed <br />cover with 24" deep skirt. Pre -assembled, all welded construction. <br />Vents <br />Updraft Vent—FIG 354 <br />"Open" vent used on underground and aboveground tanks for motor fueling. Vent allows tank to "breathe" <br />during filling/dispensing operations. Some sizes are CARB approved. <br />Pressure/Vacuum Vent—FIG 749 Series <br />Vent valve used on underground and low volume aboveground tanks for motor fueling. Vent allows tank <br />to 'breathe" during filling and dispensing operations. Poppets seal vapors in the tank when pressure is <br />equalized. The Fig 749CRB style is CARB approved for Stage I and II. Available with NPT threads or <br />slip-on style. <br />Drop Tubes—FIG 419 Series <br />Directs product flow to liquid level when filling a storage tank. Standard <br />industry practice. Prevents free fall and agitation of liquid when filling. <br />Flange fits inside groove of tight fill adaptor and tube extends down to <br />near bottom of tank. _ <br />http://v7vrw.raorbros.c,or /Service Station.htni 10/24/2003 <br />