As an Amazon Associate, we earn from qualifying purchases. Alpha TTU-DONUT Donut Adapter for TTU-1 Series | 123 Security Products Alpha . TTU-DONUT Gallery Attributes Brand name, Manufacturer name, ManufacturerAlpha Extra Product NameAlpha TTU-DONUT Donut Adapter for TTU-1 Series | 123 Security Products moq, multiple, tierMinQty11 MPN, SKUTTU-DONUT qtyInStock-2 qtySourcefixQty1 snippetThe TTU-DONUT is a donut adapter for TTU-1 series, allows the TTU-1 series talk- thru communicator to be mounted on a large opening. tierPrice1311.8 Distributor offers SellerSKUMOQIn stockMultiplePrices 123securityproducts.comTTU-DONUT1-211 @ $311.80