Dometic 300, 310, And 320 Toilet Seal Gasket Kit Replacement For Rvs:, Pack. Product Details ?Compatibility?RV Toilet Seal Replacement for Dometic 300 310 320 RV Toilet Gasket Flush Ball Seal Kit - Replace Part Number 385311658. Does Not Fit 210, 510 Or Any Other Models Not Listed. ?High Quality? Our rv toilet seal is made of special rubber so it has long service life. Our factory use original device to make molds making gasket fit perfectly. It will help you fix your problem and keep water in place. ?Easy to Install?It only take you a few minutes to install. Just popped the old seal out (no disassembly required of the toilet) and put the new flush ball seal in place ensuring it's seated in fully. Note that the marked side is facing up. ?Size?Outer Diameter: 4 Inch; Inner Diameter: 2.75 Inch. Package includes: 2 pieces of rv toilet seal. ?Save Money?No need to buy a new toilet or pay more than $30 to change the seal. Our rv toilet seal is a cost-effective and high-quality product, which can meet your needs. If you have any concerns or questions, please get in contact with our customer service. Payment We accept PayPal and credit cards via PayPal. Taxes - US We collect sales tax, as required by law. Shipping We make every effort of shipping within 3 business day of payment clearing. The estimated delivery time is 2 - 5 business days from the shipping date. Policies If you do need to return your item, please contact us via email (you will receive an email when your product ships with additional details - Subject: Important information about your purchase). You will then be provided with a return shipping label and packing slip. Pack the item carefully. Include the packing slip, apply the shipping label, and return the item within 30 business days of the date you request a return, or your return will be canceled. Once we receive your order we will inspect the return. Please allow up to 5 business days of receiving the returned item for your refund.