RV Holding Tank Blank, ABS-End Drain-18 GallonCamper Holding Tank, 18 Gallon End Drain, is vacuum formed from tough, durable ABS plastic. Tank lids are glued, welded, and edge-sealed. All tanks have 1" screw flanges around the outside perimeter for ease of installation. It is recommended that all tanks be strapped. Tank size 15" W x 58 1/2" L x 7" D x 7" B. Tank holds 18 gallons. (Blank-Must drill/cut your own openings for fittings). Use a hole saw to create holes for ABS fitting. For 3" fitting use a 3 1/8" hole saw. For 2" fitting use a 2 1/8" hole saw. For 1 1/2" fitting use a 1 5/8" hole saw. Use ABS cement to install fittings.   Also available in:   Bottom Drain *881054 - 18" W x 22" L x 6" D x 11" B (7 gal.)   Side Drains  *881202 -  21" W x 27" L x 6" D x 7" B (10 gal.) *881215 - 24" W x 48" L x 7" D x 24" B (20 gal.) *881205 - 30" W x 50" L x 8" D x 31" B (32 gal.) *881228 - 30" W x 56" L x 7" D x 28" B (24 gal.) *881233 - 22" W x 64" L x 8 1/2" D x 6" B (26 gal. RH) *881234 - 22" W x 64" L x 8 1/2" D x 6" B (23 gal. LH) *881235 - 24" W x 63" L x 7" D x 8 1/2" B (23 gal. RH)   End Drains *881201 - 17 1/2" W x 29" L x 6" D x 5" B (7 1/2  gal.) *881056 - 17 1/2" W x 35" L x 9" D x 8 3/4" B (15 gal.) *881211 - 18" W x 48" L x 9" D x 5" B (20 gal.) *881209 - 24" W x 36" L x 9" D x 12" B (22 gal.) *881060 - 24" W x 48" L x 9" D x 12" B (35 gal.) *881212 - 32" W x 32" L x 9" D x 16" B (27 1/2 gal.) *881232 - 22" W x 54" L x 9 1/2" D x 11" B (28 gal.) *881391 - 20" W x 64" L x 6" D   Recessed End Drains *881053 - 21" W x 30" L x 11" D x 10 1/2" B (20 gal.) *881223 - 17" W x 43" L x 11" D x 8 1/2" B (22 gal.) *881208 - 24" W x 43" L x 11" D x 12" B (36 gal.)   Made by: Ameri-Kart Corp.   Holding Tank Tip: Wait until your tank is at least 2/3 full before dumping. This ensures there is enough water in the tank to flush the solids from the tank. When it's time to dump, empty the black water (commode) tank first followed by the grey water (galley, shower, sink) tank.Camper Holding Tank Blank, ABS-End Drain-18 Gallon