Product Description LASCO SB-8 Faucet Seats, 1/2-Inch x 20 Thread x 7/16-Inch Length, Fits American Standard Brand Faucets, Brass, 2-Pack. Brass faucet seat. 1/2-Inch x 20 threads x 7/16-Inch in length. Fits American Standard Brand Faucets. Original equipment manufacturer number 57281-07. Faucet replacement part. From the Manufacturer LASCO SB-8 Faucet Seats, 1/2-Inch x 20 Thread x 7/16-Inch Length, Fits American Standard Brand Faucets, Brass, 2-Pack. Brass faucet seat. 1/2-Inch x 20 threads x 7/16-Inch in length. Fits American Standard Brand Faucets. Original equipment manufacturer number 57281-07. Faucet replacement part.