The SeaCure Custom Mouthpiece is available in five colors and five sizes. The size of the mouthpiece varies only on the part that connects to the orifice of the regulator. The actual bite tabs (part that goes in the mouth) do not vary in size. Each mouthpiece is professionally packaged with the following components: Moldable Mouthpiece Bite Limiting Plug and Chain Zip Tie Instruction Booklet Packaging for professional hook display Size Guide: SeaCure 1 - fits regulator size 1-1/8" x 1/2" or 2.86 cm x 1.27 cm APOLLO AQUA LUNG - older metal regulators, Conshelf 7 through 21 (snug fit) ATOMIC - manufactured pre-2005 only BEUCHAT - Evolution, Iceberg, Nitrox, VXT8, VXT Octo, VX4, VX80 CRESSI - XS Compact (snug fit) DACOR - Pacer Aero (snug fit), post-1992 models IST (except Proline is a 2) NEX - Monterey OCEAN MASTER PRO SUB - Avalon SCUBAPRO - S600, S360, S560, R095, R295, R395, and all models before the A700 SEAC SHERWOOD - most early models, Brut, Magnum II, Shadow, pre-1992 Blizzard and Oasis SPARE AIR SUBGEAR - SG100, SG500, SG1000, Aruba, Bonaire, Cayman TABATA/TUSA (not TUSA Imprix) SeaCure 2 - fits regulator size 1-3/16" x 5/8" or 3.02 cm x 1.59 cm AERIS AQUA LUNG - Calypso, Core, Helix, Kronos, Legend, Mikron, Titan (Titan LX is a 4) ATOMIC - manufactured post-2005, Z2, Z3, B2, T2X, T3, M1, ST1, TFX BEUCHAT - VS3, VS4, VS8, VX10 CRESSI - Ellipse, Master Cromo DACOR - Viper and Eagle DEEP 6 - Signature Series DGX Gears - D6 DIVE RITE - including O2ptima rebreather, but not the Jet Stream 4500 EDGE - Hog and Epic FORTE GENESIS HALCYON - rebreather and regulators HOLLIS - regulators (except 500SE is a 4) IDI REGULATORS - no longer in business (all but Osprey which is a size 1) MARES (not MARES MR-12-II, III, IV or V) OCEAN EDGE OCEAN REEF OCEANIC - including the Alpha 10 (cannot fit Alpha 9 or Omega 3) ODYSSEY SCUBA MAX SCUBAPRO - A700, C200, C300, C350, C370, G250, G260, R195, S270, S620Ti, D420 SEA ELITE SHERWOOD - 9000 Series, Maximus, SR1, SR2, 1992 and newer Blizzard and Oasis SPORASUB SUBGEAR - SG10, SG30, SG50 TIGULLIO TILOS XS SCUBA - Inspire and Brawn ZEAGLE - F8 SeaCure 3 - same diameter as a Size 1 with double retention ribbing. These regulators do not have the conventional retention lip on the mouthpiece orifice common to all other regulators and therefore no other SeaCure model should be used. AQUA LUNG - older plastic regulators including Micra AQUATEC SeaCure 4 - fits regulator size 1-5/16" x 11/16" or 3.33 cm x 1.75 cm - fits Apeks, Aqua Lung Titan LX, DGX Gears XTRA, Hollis 500SE, Zeagle regulators (except F8 is a 2), and many rebreathers, including Golem Shrimp BOV, Hollis Prism and Explorer, innerspace Megalodon, Kiss Gem, and Titan (size 2 may be a snug fit) SeaCure 5 - fits regulator size 1-7/16" x 13/16" or 3.65 cm x 2.06 cm - fits Poseidon regulators, Poseidon SE7EN CCR and Poseidon VI CCR, Divesoft BOV (snug fit) Snorkels - SeaCure fits many removable mouthpiece snorkels on the market Size 1 - Amico, Coral, Cressi-Sub, Dacor, Dive Buddy, Netex, Oceanic, Reef Buddy, SeaQuest Size 2 - Chiaro, H2Odyssey, IDI, Parkway, Pic, Technisub Size 3 - Aqua Lung Impulse, Kapitol Reef, SeaVision NOTE: If not sure of the correct size, simply measure the edge of the opening of the regulator, rebreather, or snorkel (not including the outer lip), as in the diagram below, top to bottom and side to side, and compare to the above measurements. WarrantySeaCure mouthpieces are warranted to be free from defects in workmanship and materials when packaged and shipped. Liability under this warranty is limited to the cost of replacement of the SeaCure Custom Mouthpiece sold to the original purchaser. No other warranties related to the use of our product are expressed or implied by SeaCure Custom Mouthpiece.