Which TOTO Series Come as Two-Piece Toilets
TOTO builds most of its best-known series as two-piece toilets: the Drake, Drake II and Drake Transitional, the Aquia IV with its Arc and Cube variants, the Nexus, Vespin II, Glaston and Connelly. They fall into two visual groups: some leave the trapway visible as a ridge along the side of the bowl, and the rest are skirted, with the ceramic running straight down to the floor.
The Drake Family: Drake, Drake II and Drake Transitional
The TOTO Drake two-piece elongated toilet is a 1.28 GPF toilet with TORNADO FLUSH, a CEFIONTECT-glazed bowl, a 12-inch rough-in and a chrome trip lever, and the seat is sold separately — the line item buyers most often miss when they compare prices. The Drake II is the newer body: also 1.28 GPF and TORNADO FLUSH, Universal Height, with a computer-designed, fully glazed trapway, and a 12-inch rough-in with no alternative offered. The Drake Transitional keeps the same 1.28 GPF TORNADO FLUSH and adds a skirted base and softer lines at Universal Height. Both the Drake and the Drake Transitional offer a 10-inch version on some models, and on those two it is a separate toilet rather than an adapter.
The Skirted Series: Aquia IV, Vespin II, Glaston and Nexus
Skirted means the ceramic covers the trapway, so there is no ridged profile to clean around. The Aquia IV is the dual flush two-piece at 1.28 / 0.9 GPF, sold in the original shape plus Arc and Cube styling; the Arc pairs DYNAMAX TORNADO FLUSH with Universal Height and a completely skirted body. Vespin II and Glaston are both 1.28 GPF TORNADO FLUSH, Universal Height and fully skirted, and both take TOTO's Unifit adapter for a 10-inch or 14-inch rough-in. The Nexus is the exception in that group: clean-lined and skirted, offered at 1.28 GPF and at 1.0 GPF as the 1G, with a SoftClose seat included — but in 12-inch and 14-inch rough-ins only. There is no 10-inch Nexus.
Connelly
The Connelly is the other dual flush option, running 1.28 / 0.9 GPF through 3D TORNADO FLUSH on an elongated Universal Height bowl with CEFIONTECT glaze. Its rough-in is 12 inches with no alternative offered, so measure before you fall for it.
Are TOTO Two-Piece Toilets Worth It?
TOTO two-piece toilets are worth it if what you care about is how the bowl gets flushed and how long it stays clean, rather than how seamless the fixture looks. TORNADO FLUSH uses two powerful nozzles to create a centrifugal, cyclonic rinsing action that reduces waste buildup and keeps the bowl cleaner, and CEFIONTECT is a ceramic glaze that creates an extraordinarily smooth surface so debris has less to cling to. On WASHLET+ models those two work with PREMIST, which wets the bowl before each use, and EWATER+, which mists the wand and bowl afterward — TOTO groups these technologies together as Clean Synergy.
The format itself buys you two pieces you can carry separately, components that are easier to replace than on a fused one-piece, and a wider range of configurations and price points. Budget for the extras, though. On the Drake, Drake II and Glaston the seat is sold separately. The Unifit adapter for a 10-inch or 14-inch rough-in is a separate part fitted during installation, and it cannot be added later without lifting the toilet.
How to Choose a TOTO Two-Piece Toilet
Five decisions narrow this collection to a short list: rough-in, bowl shape, seat height, flush volume, and how much WASHLET you want on top. Work through them in that order, because the first one can eliminate entire series.
1. Measure your rough-in first
Rough-in is the distance from the finished wall to the center of the closet bolts at the base of the toilet, and toilets are made in 10, 12 and 14 inch versions only. Measure to the wall rather than the baseboard, and use the back pair of bolts if there are four. Twelve inches is the common size, but measure yours before ordering. Among the series here, the Aquia IV, Vespin II and Glaston reach 10 and 14 inches using TOTO's Unifit adapter, sold separately. The Nexus offers 12 and 14 inches only. Drake II and Connelly are 12 inches only, and the Drake and Drake Transitional handle 10 inches with a separate model instead of an adapter. Our toilet rough-in size guide has the full series table, and 14-inch rough-in toilets are grouped separately.
2. Elongated or round
Almost every TOTO two-piece is elongated. Measure from the center of the seat bolts to the front edge of the ceramic, not the seat: about 18.5 inches is elongated, about 16.5 inches is round. Elongated gives you nearly the whole range; round buys back roughly two inches of floor depth, which matters in a powder room. The Drake II is the round-bowl option stocked here, and the rest sit in round toilets. More in our guide to elongated versus round bowls.
3. Standard height or Universal Height
Universal Height puts the seat roughly 17 to 19 inches off the floor, against about 15 inches for standard height, and it meets ADA seat height. TOTO encodes it in the model number: an F in the SKU means Universal Height, so two listings that differ by one letter are the same toilet at two heights. Vespin II, Glaston, Nexus and Drake Transitional are Universal Height, while the Drake and Aquia IV are stocked in both. See tall toilets or read Universal Height versus standard height.
4. Flush volume: 1.28, 1.0 or dual flush
Most models here run 1.28 GPF. The 1G versions of the Nexus, Vespin II, Glaston and Drake II drop to 1.0 GPF using the same TORNADO FLUSH engineering, and they are collected in 1.0 GPF toilets. The Aquia IV and Connelly are dual flush at 1.28 / 0.9 GPF, so you pick the volume at the lever. Flush volume and flush quality are separate questions, which is what our guide to 1.28 versus 1.6 GPF works through.
5. Decide how much WASHLET you want
Most products here are WASHLET+ sets, where the toilet and bidet seat are bought and installed as one system and no water or electrical connections show. The tiers step up in a straight line: the S2 covers front and rear washing, a heated seat, an air dryer with deodorizer and PREMIST; the S5 does the same in a slimmer body with a remote; the S7 adds auto flush, wide front cleansing and a night light; the S7A adds an automatic open/close lid. To buy the toilet now and the seat later, see the standalone TOTO WASHLET seats, or the matched WASHLET+ toilet sets.
Two-Piece or One-Piece?
A two-piece is the better buy when you want more configurations and price points, easier handling during installation, and the ability to replace one component instead of the whole fixture. A one-piece is the better buy when you want a seamless shape and fewer exterior surfaces to wipe. The flush engineering does not pick sides, since TORNADO FLUSH and CEFIONTECT appear on both formats, so this is a decision about shape, handling and serviceability. Compare the same technologies in TOTO one-piece toilets, or read one-piece versus two-piece toilets.