Lawson SuperFlow Large Area Drain Grate, 18" x 72"
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Lawson SuperFlow Large Area Drain Grate, 18" x 72"

Item Number: NNG187250

Large area SuperFlow main drain grates begin at 18" × 36" and larger in 18" increments. SuperFlow capacity starting at 2080 GPM is unmatched. Install end-to-end to accommodate higher flow rates; no additional support required. Custom framing available to fit any length.

Features include:

  • Tested to ANSI/ASME per section 1404 of the Virginia Graeme Baker Pool and Spa Safety Act
  • A raised, cross-ridged profile for non-slip surface and to allow water penetration if blocked
  • PVC material
  • For multiple drain use
  • Wall or floor installation
  • Ten-year warranty
  • Contact us for specifications and pricing of other lengths.


  • 18" × 36" – 2080 GPM Floor, 1496 GPM Wall; 343.44 sq. in. open area
  • 18" × 54" – 3120 GPM Floor; 514.66 sq. in. open area
  • 18" × 72" – 4160 GPM Floor, 686.88 sq. in. open area

Manufacturer recommeds cover replacement after 10 installed years.

$2,762.43 /EA
    • EA
  • Availability: Contact us for availability information

This item is eligible for return.

Neptune Benson products are eligible for return within 1 year of delivery. Returns are subject to manufacturer inspection. Items that are returned for credit must be standard, current, and saleable items in "Like New" condition. Any cost incurred to restore items to this condition will be deducted from the final credit. Returns are subject to a 25% restocking fee or $50 (whichever is greater).

Contact us to obtain a Return Authorization.