Part # A B C D
56572TH 3" 3-7/16" 1-7/8" 1/2"
Threaded Thru Hull
56572TH Threaded Long Thru Hull
56553KT Replacement Flapper Kit
Part # Inv.Class* Std.Pk. Req. Hole Size NPSM+NPT Thread† Material Finish Fastener Type Fastener Incl. Notes
56572TH B 24 1-7/8" 1-1/2" 316 Stainless Steel Bright polish Grounding Screw Yes † Last ½" is threaded NPT
56553KT A Replacement flapper kit for 56553, 56557, 56572TH
* Indicates inventory availability
  1. Catalog items typically kept in stock and available for immediate shipment.
  2. Catalog items where inventory levels are determined by customer forecasts. May require lead time for new orders.
  3. Produced from custom tooling and stocked to purchase orders only.