+3 Prince RD513AA5A4B1 One Spool, Single-Acting 20-1001-75 $254.39 In stock Quantity: 1 Add to Bag Product Details 20-1001-75 Prince 513AA5A4B1 One Single-Acting spool, All ports 3/4 npt. Single acting valves: plug "A" port and use "B" port (farthest from handle) All Prince valves are now painted black. Convert to closed center - use 312005 conversion plug. Power Beyond - use 312008 conversion plug. Replacement Parts here Save this product for later Favorite