Our leather water pump seals are durable, pliable and precision made for easy installation on any water pump Quality leathers are always preserved with oil, which may cause an oily film or smell during the first few weeks of use Easy to installed on the plunger Dimensions: 5/8" outside diameter x 1/4" inside diameter Our leather water pump seals are durable, pliable and precision made for easy installation on any water pump. Lehman's has replacement parts for any water pump or cylinder that we carry and more! Dimensions: 5/8" outside diameter x 1/4" inside diameter Note: Quality leathers are always preserved with oil, which may cause an oily film or smell during the first few weeks of use.